Tenwin Electric Battery Operated Automatic Pencil Eraser with 22 Eraser Refills (Black) Features: Made from plastic, durable and very convenient. This compact electric eraser can erase small areas on artwork quickly and precisely. Moderate size suits hands perfectly, portable and comfortable to hold. Equipped with 10pcs 2.3mm eraser refills and 10pcs 5mm eraser refills that you can change the size of the core, and the length of core can be adjusted. Labor-saving and effective, perfect stationery for art students, teachers and those drawing lovers. Specification: Brand: Tenwin  Material: Plastic Weight: 64g/2.3oz Electric Eraser Length: 17.3cm/6.8inch Eraser Refills Diameter: 2.3mm/0.01inch, 5mm/0.2inch  Battery Model: AAA Batteries*2 (Not included) Package List: 1 x Electric Eraser (Battery Not Included) 10 x 2.3mm Eraser Refills 10 x 5mm Eraser Refills Note: 1. Please allow 1-3cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 3. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.