Features: Bite-Resistant: made of TPR, so it can help your dog reduce destructive behaviors. Definitely a aggressive chewer toy and you no longer- have to worry about your shoes, sofas or other furnitures suffering damage. Dog Training Toy: Enjoy more fun with your pet, and enhance the relationship between the owner and the pet. Clean Teeth and Relieve Loneliness: Dogs need to grind- their teeth frequently, otherwise may cause bad mouth odor or tooth decay. Our dog Bitting toy for aggressive chewers can perfectly solve these problems. 2.2inch diameter, standard size for dog puppy chewing/playing~. Built-in glowing bar, dogs prefer it!! Specifications: Material: Plastic Size: Approx.5.5cm/2.17inch Type: Spiky / Smooth Color: Random Package Includes: 12x Dog Chewing Ball note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color of the item.