Type: Sport rims "3 blades" (or 3 blades) for mountain bikes (MTB) and hybrids. Material: Made of Magnesium Alloy, which is a lightweight and rust-resistant material. Size: The common size for this design is 26 inches. Features: Brake system: Supports "Disc" brakes. Usage: Provides high stability and durability for off-road conditions, and is considered an aesthetic and practical upgrade for the bike (disadvantages of the rims, they need bearings, they don't have them).