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Rollers material: These bubble rollers are made of good quality aluminum alloy material through mechanical finishing. Wide applications: It is widely applied in the production of glass steel industry to level and compact the resin coating and to expel air bubbles. Work effectively: It is an economical and practical hand tool in fiberglass production. Using these products not only saves time and effort, also effectively improves labor efficiency and product quality. Tips: Soak it over night in acetone after use and its always clean as a whistle the next morning. Specification: Roller size: about 12.5 x 75 mm Color of the handle: Black