Mini Roller Covers: 4 in. wide, 1/2 in. thickness, High absorption acrylic paint rollers 9-pieces, flexible for craft projects that require more than a paint brush. Taking new technology of Hyperthermia bonding PP tube with microfiber naps enabling the paint rollers workable for all paints and stains, such as oil based, water based paint, latex, rustoleum, concrete, polyurethane and so on. Roller Frame: Chrome plating shafts, approx. 10 in. long. Plastic Roller Handles can be attached to an extension pole for ceiling or high walls painting. The newly designed ergonomic comfortable handle, extremely suitable for interior and exterior painting jobs. Tips for after-use: Wrap them in a plastic bag to keep them from drying out so that you could use them the next day. Kindly note that it is ribs structure, not threads structure for attaching to threaded poles.