4" (100mm) High Density Foam Mini Paint Roller Refills, 10 Pack - 

These trade quality high density foam mini rollers are made using open-cell foam which absorbs paint, releasing it gradually through each roll and giving even surface coverage for less working out and a superb finish with no roller texture. Ideal for applying water- and solvent-based gloss and satin paints as well as undercoat and primer on smooth wood and metal, the high density cells avoid creating air pockets, eliminating bubbles in the paint that could otherwise spoil the finish.