The skin material is special PU which touches like gator skin, the surface is rough but feels soft. It is easier to grasp, wear-resistant and durable. The small hole on dodgeball makes the ball automatically inflated and restore after pressing. Unlike typical rubber balls, the surface of these balls does not sting on impact - great for all ages. This toy is suitable for indoor and outdoor use. Challenge your children's imaginations and keep them active. Enjoy your family time and have fun together