Tuffy Microfiber balls are designed to hold up the an aggressive chewer. These tough dog toys are made with 2 layers of material, microfiber plush on the outside and nonwoven fleece on the inside. All of these layers are sewn together to make the toy even stronger. If you are looking for a plush toy for an aggressive chewer, Tuffy Dog toys are what you need. Available in mulitple shapes and creatures.