SumoGrip Erasers are composed of micro porous cells that are constructed like a net that picks up graphite marks and erases better across the surface. Reticulated open-cell foam works like ultra-fine sandpaper to get into the small grooves and pits of the paper surface. Combining our existing Sakura Foam W Eraser with a firmer hybrid-matrix formula, the SumoGrip Eraser requires minimal pressure to remove graphite lead from B to 2H degrees. The new foam technology of SumoGrip erasers vastly improves the pick-up of micro-graphite particles from paper substrates that white PVC erasers leave behind.