The CaliberDog Bite Developer is made by professionals for professionals. This sturdy sleeve will last for a long time when the sleeve cover is used. The sleeve is made from NK material which is specially made for bite sleeves. There is no more metal or hard plastic for increased safety for the canine. The sleeve bite bar can be adjusted in 3 ways. There are 2 inserts in the bite bar which can be removed to decrease the stiffness of the bar. This feature is ideal for training puppies or canines new to bite development. There is a padded handle inside the sleeve for comfort. The barrel of the sleeve is made from hard plastic to protect you from any missed bites. The hand stitching not only make the sleeve look great but it gives it outstanding durability.