practical tool for fiberglass projects -- fiberglass roller set is a must have tool for getting air bubbles out of freshly laid fiberglass resin and the helpful items for getting a smooth finish on a patch in your home improvement project. effective & efficient -- the proffesional aluminum fiberglass roller set can effectively enhance strength and flatness of the glass steel, make fiberglass projects easy and effortless. wide application -- widely used in the production of glass fiber reinforced plastics, and the inner surface of the bubble roller puncture. easy clean -- these aluminum rollers set industry standards for durability and ease of cleaning.the plastic handle is solvent resistant and easy to clean. 3 pieces fiberglass roller -- 1 in larger diameter used to flatten compacted resin coatings and drive bubbles, 1 in medium diameter has deeper grooves for thicker laminate, 1 piece roller for air bubbles on corners.