Hot Ink Roller is used to print the prodcution information such as the production/expiration date, batch number, lot etc. on the packing materials.It can be used on many kinds of the packing materials such as paper,plasitc film etc.. Name:Hot Ink Roller Model: ML-20#,ML-23#,ML-25#,ML-31# Size:36mm*10mm/16mm/32mm 40mm*40mm 48mm*60mm Substrates:Paper, PP/PE/PET etc. Color: Black, White, Green, Yellow, Orange etc.