- Textured to avoid slippage
- Built in one-way valve also serves as bite block
- Single use, 1 per unit
- 1-1/2 width unit box
"CPR/BLS renewal... MY GO TO PLACE. Instructor's here make the class interesting and not boring at all. The first time I took a CPR/BLS certification class it was SOOO boring I kept staring at the clock waiting for time to pass...but not here ;)"