Patented innovation: The printing is done through a physical reaction rather than a chemical reaction like standard thermal papers. The Safe Contact thermal rolls are free from chemical developers, making them safe for health and even approved for direct contact with food. The thermal rolls are made from a slightly bluish paper that is resistant to heat, sunlight, and moisture, ensuring long-lasting prints: the text on the receipts remains legible for at least 35 years. Environmentally friendly paper and recyclable along with paper waste. Use for product: EC-Cash. Dimensions: 57 mm x 18 m (W x L). Diameter: 40 mm. Core diameter: 12 mm. Weight: 52 g/m². Control strip present: Yes. Certificate/Approval: Forest Stewardship Council (FSC). BPA-free: Yes. Phenol-free: Yes. Color: blue. Text of the print (back): Safe Contact. Quantity per pack: 20 pcs/pack.