TST Phenol-Free Thermal Paper POS Receipt Rolls - 3 1/8" x 220' (7/16" Core) - 50 Total Rolls Phenol Free Thermal Paper Rolls. Total of 50 in a package. Caliper: 2.1 mil | Image Life: 5 years with proper storage. Manufactured without BPA, BPS or other phenol based thermal developers. Includes Vitamin C as thermal image developer. Natural yellow color on front (thermal imaging) side. White backside. Low caliper for longer roll length. Lower basis weight reduces freight costs. Good imaging for short life receipts. 3 1/8" x 220' - 7/16" core.