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100% ADJUSTABLE RESISTANCE VALVE FOR BOTH, INHALING AND EXHALING BREATHING EXERCISE. - RANKED #1 ABOVE ALL OTHER BREATHING EXERCISERS AND ELEVATION TRAINING MASKS!!! - VERY EASY INSTRUCTIONS COME IN THE PACKAGE.
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Technical Details

Product Details

Package Dimensions
Width : 4 inch
Height : 2 inch
Length : 8 inch

Shipping Weight: 0 ounce (View shipping rates and policies)

ASIN : B00JWTRA5I