Product size: The carbon brush size of this product is 17mm long, 15mm wide, and 7mm high. Manual measurements, please allow slight errors. Compatibility: This product is Compatible with RUBIMIX-9, Compatible with RUBIMIX-9 PLUS, and Compatible with RUBIMIX-9 DUPLEX. Product material: This product is specially designed and made of metal material, which has a long service life and is not easy to damage. Easy to install: It can be directly replaced without adjustment, with perfect compatibility and high reliability. Product list: Product include a total of 4pcs Carbon Brushes, which can completely meet your daily use needs and replacement., Manufacturer: VGOL