A metal grating for sound games or to place marbles or beads in rows or other patterns.
Objects with rougher textures are more motivating for development of the tactual sense than smooth surfaces. Examples: hairbrushes, artificial grass and a draining set for soap.
A fan, a ball made with wooden sticks and a natural sponge.
When buttons are horizontal and beads are vertical on a string, the material is easy to grasp and easier to keep hold.