Benefits And Preferences Of A Breath Trainer Made Of High Quality Silicone With Excellent Elasticity: Classified And Evaluated By Testimonies Of Athletes And People Who Compare Them With Other Similar Devices. This Trainer Breathing Exercise Device Has Exceeded, In Functionality, Optimal Results And Satisfaction In Their Daily Use. It Has Compact Composition And Tight Dimensions Of 1.97" X 3.94" Inch With Its Low Weighting Of 1.41 Oz. Make It A Comfortable And Easy Regulatory Adjustment. Removable Construction Is More Convenient And Easier To Clean.