ROCK-JAW (Neck & Jaw Strengthener for boxers)
The Rock Jaw is the only jaw strengthener available! Reduce your chances of getting knocked out ,a neck injury,or broken jaw! The Rockjaw is great! for boxers,MMA fighters,kick boxers,wrestlers,judo,all contact sports or anyone who drives and is concerned about car accident injurys. Competitions are won and lost due to muscle capability of the jaw and neck. Make your neck and jaw rock solid with Rock-Jaw.