This design of multisided, edge-shaped eraser is easier to use then most conventional erasers due to its ability to erase narrow and small areas where most erasers cannot reach. After continuous usage, it becomes rounder like the pebbles along the shore.

The ideas came from the fact that edgy stones endure a long journey down the river to the ocean shore. Along the way, the edges are curved into irregular shapes. Won the Gold award for  2009 Taiwan International Design Competition. Available in black, white and grey here.