Does it come with instructions?

Yes it comes with instructions both with the product and again digitally by email.

does it improve my reaction time ?

We used these for my daughter to help her eyes work together. It was suggested by her vision therapist. I played around with it also and you do get better at focusing.

Are the balls removable?

You could fairly easily remove them by untying the knot at the end of the string. However it may be tricky to put them back on.

Can this be used in the bedroom?

Hi, Brock String is a vision performance training tool that can be used anywhere.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility

Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility

Product ID: 294748062

Details

Brand
Brock String
Material
Nylon (PP)
Recommended uses for product
Exercise and
Special features
Durable
Target audience
Adult

⚽5 beads for precise convergence points

📏6-foot length for versatile training

🛡️Durable high-quality nylon string

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Bs.346

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In stock

Sold byAmazon BoliviaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

👁️‍🗨️ Sharpen Your Sight, Elevate Your Game!

BUILT TO LAST - Premium durable materials ensure long-lasting use even with daily training sessions.
TRAIN LIKE A PRO - 6-foot string with 5 beads targets sport-specific eye positions for peak athletic performance.
COMPLETE GUIDANCE - Includes clear instructions so you can start improving your vision immediately.
EFFORTLESS HOME USE - Simple setup with minimal learning curve—train your vision anytime, anywhere.
BOOST VISUAL STRENGTH - Improves eye convergence to enhance focus and reduce strain during high-demand tasks.

The Brock String BFR Bands Vision Convergence Training Tool is a 6-foot durable nylon string with 5 adjustable beads designed to improve eye convergence and athletic visual performance. Ideal for home use, it offers a simple, effective way to train eye strength and focus, backed by high-quality materials and clear instructions.

Specifications

ASIN	B0190LOMCQ
Brand	Brock String
Brand Name	Brock String
Color	White
Customer Reviews	4.5 out of 5 stars 1,084 Reviews
Grip Material	Ethylene Vinyl Acetate Foam
Handle Diameter	38 month
Handle Material	Ethylene Vinyl Acetate (EVA)
Handle material	Ethylene Vinyl Acetate (EVA)
Item Length	6 Feet
Item Weight	0.02 Kilograms
Manufacturer	NeuroVision
Material	Nylon Polypropylene (PP)
Model Number	9G-WVV7-SZRG
Other Special Features of the Product	Durable
Part Number	9G-WVV7-SZRG
Recommended Uses For Product	Exercise and Fitness
Recommended uses for product	Exercise and Fitness
Special features	Durable
Target Audience	Adult
Target audience	Adult
UPC	860007923074 722512440333
Unit Count	1 Count

Reviews

S**H

Received in a good condition

It arrived in a good condition, both the bead and the string are of good quality. The bead also doesn't shift easily so it is great!

8.02.2020

J**B

Good quality, easy to use

It's good. The beads slide easily but stay where you put them. The string is easy to tie and untie. The string can be drawn taunt and bounce is easily controlled.

2.12.2025

G**A

Approvato

Prodotto come promesso. Ottimo.

21.06.2019

A**F

Five Stars

Works as expected. Cheaper than trying to make one yourself.

12.11.2017

A**E

Beads do not stay in place as inteded and needed.

The beads are supposed to stay in place on the cord in order to use it. They just slide along the cord, it appears the holes in the beads are too large. Very poor quality control.

14.04.2025

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Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

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Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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Bs.346

Duties & taxes included

In stock

Sold byAmazon BoliviaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Bolivia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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