【Paper Size】3-1/8" x 230', 30 rolls in total. Every 5 rolls thermal paper pack together, more convenient to storage. 【Red Warning Line】Each thermal paper roll has a red warning line, it indicates that the paper is running low and will need replacing soon. 【Smooth Printing】Our thermal POS paper is smooth and delicate, prints smoothly and protects your printer. 【Clear and Lasting】High-quality thermal paper provides crisp and long-lasting images. 【Thermal Printing】Thermal paper is evenly coated with a thermal layer, no carbon ribbon required and convenient printing. Compatible with SRP-350, SRP-350plus, SRP-352plus, SRP-370, SRP-372, STP-131 Citizen CBM1000, CBM230, CBM231, CBM293, IDP3210, IDP3310, LT380, RJV-2000, CT-S310, CT-S810, CT-S4000 (3 1/8"), CT-S300, CT-S2000 M129B, M129C T20, T20II, T90 Series, TMU 6000 Star Micronics SCP700, TSP100, TSP300 Series, TSP400 Series, TSP500 Series, TSP600 Series,TSP 700 Series,TSP2000 SeriesTSP-650, TSP700II, TSP 800