ROBERTS 4 in. Star Wheel Pro Carpet Seam Roller is ideal to seam loop pile and Berber carpets. It is designed with star wheels on the roller to maximize the transfer of hot-melt tape into the carpet and produce stronger seams. It is engineered with a large handle on top of a rugged steel frame for a comfortable grip, and durability. Very easy to use, this is a must-have tool for installers.