1. Super durable – we use the quality, incredibly tough jute exterior along with a thick foam inner layer to provide a K9 bite sleeve that is soft for your dog's teeth and keeps you safe from hard bites. 2. Recommended by dog trainers: This biting sleeve is a reward toy and exercise equipment, designed for interactive play and K9, protective dog, and protection training. It is trusted by leading dog trainers working in military and police sectors. 3. Comfortable and sturdy handles – Our dog training sleeve features a comfort grip, a strong inner handle, and an external handle. The handles will maximize your control over the gear while optimizing your bite training. Can be used on either the left or right arm. 4. size 20 x 12 inches (52 x 30 cm) – The bite sleeve has enough space for dogs to bite and for you to avoid accidental bites, allowing you to train your doggie without fear. It is for big puppies and adult medium to large breeds, such as German Shepherds, Belgian Malinois, Rottweilers, Pitbulls, etc.