Which tension color is recommended for a 10 yr old ?

It depends what the child is attempting to accomplish. Is it intended for rehabof an injury? if so check with the doctor or physical therapist. OR Is it to strengthen for a particular sport? If so, than how far along is the strength in that hand of fingers. Typically the 3 lb is for the elderly with arthritis or rehab from an injury. While the 5 & 7 pound are the most popular for all ages. However, advanced athlete find the 7 & 9 pound too "easy" and then need to advance to the PRO (more than likely too large for a 10 year old hand)You may want to look at either the TWO packs with TWO tensions , or the FOUR pack withall four tensions 3,5,7,9. Fr a child stick with the regular Gripmaster NOT the PRO.

Which tension color would be recommened for a 14 year old guitar player?

It may depend on the size of the 14 year old, male or female, beginner or experienced guitarist. The RED (7 pounds) is the most popular and since the tensions range from 3 pounds to 9 in the regular GripMasterto 13 pounds in the PRO, the 7 is a mid range tension.If the child is in progressing with the instrument, you may want to consider a twin pack with two consecutive tensions.I hope this helps.

I lost the cushion grip for my heavy tension model. Is there a way to replace it?

No, you will need to replace the entire grip.

Is simply squeezing it enough or are there any specific exercises I should try out?

Like others, I am not aware of specific exercises. I do, however, turn it "upside down" , putting my fingertips to palm side of exerciser, and depress two of the plungers with my thumb - thus exercising that oft-neglected digit. 

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💥 Grip like a pro, perform like a legend!

REHAB READY DESIGN - Trusted by athletes and therapists alike to aid recovery from arthritis, carpal tunnel, and neuropathy.
TRACK YOUR PROGRESS - Graduated tension levels let you measure gains and never plateau on your hand fitness journey.
PRO LEVEL RESISTANCE - Heavy 9 lb tension challenges your grip to build serious hand, wrist, and forearm strength.
DURABLE PREMIUM BUILD - Crafted with stainless steel springs and ABS plastic for long-lasting performance.
PRECISION FINGER ISOLATION - Target and train each finger separately for unmatched dexterity and power.

The Prohands Gripmaster is the original spring-loaded hand exerciser featuring a patented finger-piston system that isolates each finger for targeted strength training. With a heavy 9 lb tension setting, it’s engineered from premium ABS plastic and stainless steel springs to deliver durable, professional-grade resistance. Ideal for athletes, musicians, and rehabilitation, it enhances hand, wrist, and forearm power while supporting recovery from common hand ailments.

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Color	Black - Gripmaster
Size	9 lb (Heavy Tension)
Style	Heavy (Black)
Height	2.88 inches
Length	3.63 inches
Weight	0.19 Pounds
Width	0.88 inches
Shape	Oval
Material Type	Stainless Steel
Number of Items	1
Sport	Excercise & Fitness
Batteries Included?	No
Brand	Prohands
Department	unisex-adult
Manufacturer	Gripmaster
Item model number	Heavy Tension
Product Dimensions	9.22 x 2.24 x 7.32 cm; 70 g
ASIN	B0006GCBL4

Prohands Gripmaster Hand Exerciser, Finger Exerciser (Hand Grip Strengthener), Spring-Loaded, Finger-Piston System, Isolate and Exercise Each Finger

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