Two-piece set, just as pictured. This is an eraser specifically for the "Frixion series" of erasable writing instruments. By rubbing, frictional heat is generated, allowing you to erase the ink written with Frixion ink. The oval cross-section fits comfortably in your hand, making it easy to use for both fine details and large areas. #piero's stationery store all products ⇇★Touch here to find what you're looking for Frixion Refills Frixion Ball Frixion Eraser Frixion Knock Frixion Stamp Frixion Highlighter Frixion Synergy Frixion Color Frixion Ball Multi-color