Regular size. I purchased this a month ago and used it on weekends. I'm selling it because I usually use a trackball. Since it was used for a short period, there are no noticeable stains or scratches. *This is a used item. Please understand that there may be some scratches or dirt from use. Logicool Signature M750MGR Wireless - Brand: logicool - Number of buttons: 5 buttons - Shape: Ergonomic design - Scroll wheel: Yes - Connection type: Wireless 30