Large core diameter 1-3/4" version of Purdy's Colossus roller covers hold 25-35% more paint Ð increases production. Made of an exclusive formulation of 100% polyamide, Colossus roller covers lay paint off very smoothly and carry a remarkable amount of material to the surface without dripping or splattering. Perfect for rolling a great deal of new drywall quickly, Colossus roller covers hold and release more paint than any other Purdy roller fabric. Designed for heavy-duty painting projects. Also great for stucco, T1-11 siding, brick or rough-textured walls.