Octopus Glue Silicone Rubber Pasting Roller Wheel for LCD UV OCA, LOCA, Polarizer, Film Application Wheel Roller 100mm (4 inch) Perfect for safely applying polarizer film when rebuilding smartphone display assemblies. Maditory tool for perfect applicaition of OCA sheets. The silicone roller moves effortlessly across any surface. Firm enought ot get the job done, soft enough to prevent damage. 4" wide roller covers any smartphone or phablet screen.