Designed for use with Scotch (R) C-38 Tape Dispenser Comes in handy when you lose the original. 3/4in. wide. Fits tape that has a 1in. core diameter. 3M Dispensers part of a large selection of office supplies. 3M (TM) Plastic Replacement Core, 1in. is one of many Office Tape Dispensers available through Office Depot. Made by 3M.