Item Type: Electric Eraser Kit Material: Plastic, Alloy Product Features: Sketch Highlight Electric Eraser with Adjustable Thickness, Easy to Draw Highlight Effect. Battery Type: AAA Battery (Battery Not Included) Number of Batteries: 2 1Adjustable: The length of the rubber can be adjusted. Pull out the rubber head to adjust the length you want, and insert it to use. 2Replaceable Tip: Thick and thin eraser tip can be replaced, two diameter tip can be selected 5mm and 2.3mm. 3Battery Power Supply: 2 AAA Battery Open the back cover, put in 2 AAA Battery, you can use it, battery powered, more convenient to operate. 4Pen Shape: This pencil eraser has a pen shape, which is easy to hold and operate. It feels like a normal pencil to hold. 5Soft Texture: The Detail eraser is equipped with 10 small refills and 12 large refills. The rubber head is soft in texture, and the electric eraser is very clean.1 x Electric Eraser2 x Plastic Rubber Jackets10 x 2.3mm Erasers10 x 5mm Erasers