Thermal paper Prescription rolls, black mark sensor on back of sheet. Roll Width: 4 3/8", Core: 1". 250" roll (approximately 500 scripts/roll). 16 Rolls per Carton. Approved for Controlled Substances Prescription. Security features included: Unique Security Background, Production Batch Number, Hidden Message Technology, Reverse Rx, Artificial Watermark. Compatible with Star TSP800, TSP800Rx; Citizen CLP521, CLP7200, CTS4000; Datamax E Series; Dymo 4XL. Approved for use in AL, AZ, AR, CO, CT, FL, HI, ID, IL, IA, KS, LA, MD, MA, MI, MS, MT, NE, NV, NH, NM, NC, ND, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, VA, WV, WI, WY, DC, US TERRITORIES, & CANADA.