Environmentally friendly BPA Free Thermal Rolls made with American Made Advanced CORELESS Winding Technology. Coreless rolls are longer than rolls using plastic cores. With an outer diameter of only 0.85 inches or 21mm these rolls are perfect for new slim, handheld payment terminals. 2-1/4 x 21 ft 21mm / 0.85" OD Premium quality, tightly wound with perfect tension - will not fall apart.