Studio Ocean Mark Replacement Spool CT4000F Red This was attached to a Certate Hyper Custom 4000. It can also be attached to a 3500, but please confirm compatibility yourself. I cannot answer questions about compatibility with recent models. While the spool edge is not perfectly smooth to the touch, it was used as a backup for offshore fishing, so it is at a level that does not pose a problem for practical use in offshore jigging, etc. Please refrain from purchasing if you are sensitive. Daiwa Old Certate