We give our dogs bone crushing experience by using leather sleeve. Leather Sleeve is a hard bite sleeve and closest thing to real bone crushing.This sleeve is designed for the trainer or decoy that occasionally encounters a very hard biting dog. Made from heavy welders-split steer hide and lined with both foam and Cordura® nylon, it has extreme puncture resistance. The elbow is engineered to give full 90° motion and exceptional flexibility.Adding only 1/4" to the total diameter, this sleeve cuff saves your sleeve and provides an easier biting surface for our dog.