sponge special sponge poducts are safe, we can make low density, middle density and high density, most of the balls are middle spongespecial spongelogo available: for 1 color logo, we make by Movable printing or silk-screenpriting,if logo for 2 or more colors, we make logo by decal.poducts are safe, we can make low density, middle density and high density, most of the balls are middle density. ...