Alvin - Sakura - Electric Eraser Refill - 70 Pack - Replacement Eraser Refills for the Sakura Electrical Eraser. This is a 70 Pack of Electrical Eraser Refills. Alvin is one of the primary sources for drafting supplies and drawing equipment in the country. Creative Coldsnow is a pround retailer of Alvin graphic arts, drafting and fine arts products.