The StarMark Easy Glider (9") and StarMark Easy Glider Max (11") are easy to throw straight and level, even if you are inexperienced. The unique design allows for it to glide through the air without taking sharp arcs and turns, as well as land gently, making it easy for your dog to follow and catch. Plus, it is made of highly durable soft foam that will hold up to being in your dog's mouth without cutting or hurting him. It also floats in water for disc catching fun at a lake or beach. The StarMark Easy Glider is 9-inch diameter and weighs 80g. The StarMark Easy Glider Max is 11-inch diameter and weighs 180g.