Portable Lung Breathing Trainer Adjustable Resistance Improves Lung Capacity And Abdominal Strength Fitness Trainer

Product name: Breathing trainer，Product size: 10*5cm,

Type: Portable，Product weight: 42g.

Material:Food Grade Silicone APS，

colors：White ,Blue ,Red , Black, White Dots , Black Dots , Grey Dots

Applicable people: people with insufficient cardiorespiratory function and need to increase their endurance and lung capacity.