This soothing sensory ball is so cool it is like magic. The ball is filled with a thick doh like material that is a different color from its flexible skin. The skin has a soft mesh webbing that when you squeeze the ball the interior blob pops through the mesh and expose a new color. It is beautiful to watch as the colors blend together to make a two-tone ball. 3 color options - Pink to Blue / Yellow to Orange / Blue to Purple. The ball is about 2.5". This is very calming because it has a very silky soft feel, and it is filled with a thick soft almost fluffy doh that looks like soft serve ice cream. You need to feel it to really know how nice these are.