The Samsung ER-650 uses 2.25" Thermal paper rolls and because it uses thermal paper there is no ink ribbon required. This model can accept the large diameter rolls up to at least two hundred and twenty foot per roll. You can use the smaller rolls designed for credit card machines but you will be changing the paper all the time. We also carry all the replacement parts for the ER-650 like keyboard covers, cash drawer inserts, keyboards and more. Should you require support we support all the programming and options this register had available too including credit card interface.