Fitness Equipment Lung Respirator Adjustable Silicone Outdoor Expiratory Exercise Tool Black Portable

material: silicone+abs
color: black
product size: 5*10*3cm(1.97*3.94*1.18in)
application: running, cycling, swimming
package include:1 x lung fitness trainer note:
due to the different monitor and light effect, the actual color of the item might be slightly different from the color shown on the pictures. thank you!
please allow 1-3cm(0.39-1.18in) measuring deviation due to manual measurement.