The Ultimate Rolling Mini Bunny Chew Toy. Made from all natural dried yucca (NOT YUCA, which is toxic). The Mini Bunny Blast is 100-percent biodegradable. Bunnies will roll, toss and chew the natural, soft inner core of this toy for hours of fun. To assure the Mini Bunny Blast is 100% natural, we sterilize the Mini Bunny Blast by baking all raw material with heat in a kiln. Any dark coloration/scarring on Mini Bunny Blast is natural.