Jumbo Polyamide Long Pile 18mm roller 4.5 Inches wide. For applying emulsions, primers, rust-protection, oil paints, varnishes and industrial coatings onto semi rough to rough surfaces. The 2 pack of green roller are woven polyamide rollers with a Jumbo 30mm diameter core are long lasting thermo-fused construction, and compatible with all Paint Roller Handles, available on this web site.