PLEASE NOTE! THIS IS A FILL WITH YOUR OWN ROCKS PRODUCT! Also available in 8 lbsMMA FIGHT PATCH INCLUDEDROCK JAW MMA Logo 4LBSThe Ultimate Neck and Jaw Strengthener Many pro fighters are strengthening their neck and jaw to help prevent injuries. Rock Jaw is great for boxers,MMA fighters or anyone in the fight game! Just insert the mouthpiece in your mouth let the rock bag hang and lift your head up and down or side to side for repetitions. Rock Jaw is also a cosmetic product the exercise can help eliminate double chin. The jaw is the main target in the fight game! A strong neck and jaw can help absorb more shock to punches! Make your neck and jaw rock solid with Rock Jaw! "Don"t be a Glass Joe with a glass jaw! Get your Rock Jaw today!"Outside the USA Item is not shipped with rocks.Also available in BOXING logo or MISS ROCKNECK logo