Raser Plus specializes in thick gate (thick nub marks) removal using its proprietary Super-Nano Technology, which provides sanding experience powerfully, yet it leaves no scratches on the surface. Its tool for complete gate (thick nub marks) removal. Size: 20x65x5mmMaterial: Tempered GlassTechnology: Super-NanoMade in Korea With 220 grit force, Raser Plus can easily remove thick gate-marks to produce a clean surface without any scratches. Evolutionary super-nano technology provides a strong 220 grit force incomparable to any other similar products. When sanding with a typical glass file, it can scratch the surface with its edge if the sanding angle is off-balanced. However, Raser series are engineered with handcrafted soft edges to overcome such issues and it goes through a strict QA process to ensure easy and safe use by any users from novice to expert. Important Residues stuck on the Raser Plus surface can decrease performance. After use, wipe with water or masking tape to remove any residue. If cleaning with water, dry completely before using. Raser Plus made of tempered glass will not break during normal use. However, it may be damaged by external impact or falling. Always store in the storage case when not in use. Raser Plus is only used for plastics.