These specially designed seashells have different tactile surfaces and come in 3 sizes. They are made of natural Fiber Particulate Composite (FPC), which is an agricultural waste product from rice stems and rice husks. Each shell has its own natural grain as a result! Includes 36 tactile shells, 2 of each in 6 different tactile finishes and 3 sizes. Sizes: 1.6"W, 1.9"W and 2.1"W.