Offers a comprehensive solution for your polishing needs. Size Information: Our grinder polishing wheels are approximately 8 inches in diameter with a center hole diameter of approximately 5/8 inches. They consist of 12 layers to enhance polishing efficiency. Each aluminum polishing compound weighs 70g / 2.5 ounces. Quality Material: These cutting polishing wheels are made of fabric with different densities: 1 blue airway polishing wheel (12 layers) for hard polishing, 1 orange airway polishing wheel (12 layers) for coarse polishing, 1 yellow airway polishing wheel (12 layers) for medium polishing, and 1 white airway polishing wheel (12 layers) for fine polishing. The wheels are designed for various purposes, and the center ring ensures durability for long-term use, providing longer and cooler operation compared to standard polishing wheels. Recommended maximum RPM safety limit is 3000. Easy to Use: These polishing compound bars work with polishing wheels. Simply spin a polishing wheel on a grinder, motor, or drill, and lightly apply the compound against the wheel. Heat and friction will transfer the compound to the polishing wheel. Wide Application: The airway polishing wheels and polishing compound bars are suitable for polishing vehicle parts such as fuel tanks, wheels, and bumpers, as well as metal finishing and other accessories made of aluminum, brass, copper, and stainless steel. Color: As shown. Material: Metal + fabric. Package Contents: 4 pcs. * 8-inch airway polishing wheels, 5 pcs. * different functional colors of polishing compound bars. Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. The allowed measurement error is +/- 1-3 cm.