Our magnetic whiteboard eraser is made of a lightweight contoured foam, these revolutionary erasers have a soft comfort grip. And, no storage tray necessary - a strong magnet is built-in, so the eraser can be left anywhere on a magnetic receptive whiteboard. Eraser measures 4 1/2" X 2 1/2" X 7/8" , assorted colors. No color choice. 1 set each, bundle of 6, 6 sets total