WHIPBIRD Lung Breathing Trainer Exercise Device-Compact Pure Silicone Lung Exerciser Device, Respiratory Muscle Trainer, Lung Expander, Breathing Enhancer, Ideal & Adjustable For All, Easy To Clean

The silicon teeth holder is actually really good to hold on too , also the adjusting feature below is the best feature of the whole thing. It's a value for money product one should really try it if he/she is does workout or training

Whipbird breathing trainer is same like as described in description, very useful for improved stamina and many other indoor and outdoor workout, The device is easy to use and feels durable, loved this product, shortly highly recommended for better lung capacity.

Waste product.

The product is great for training endurance but the seller is a cheap stick the screw attaching the inner tube to the adjustment valve is not galvanized or rust resistant, the bitch started to rust after a week or so of regular use, I don't have u remind u what happens if u infale rust particles

The product was very nice ..... Value for money .... Easy to use and budget friendly ..... Must buy once

Very unique productHighly recommendPremium quality

good