Features: Brand new. Helps with horsepower output. Universal for most motorcycles. Made of aluminum alloy, durable materials for long time service. Professional installation is highly recommended. Fit for PWK24 PWK26 PWK28 PWK30 carburetor. Specification: Material: Aluminum Alloy Color: Silver Tone Inner Diameter: 50mm / 1.97" Dimension: 44.5x74.3mm / 1.75"x2.93"(H*D) Note: The size is measured by hand, so it may have a little 1-3 mm difference. Package Includes: 1 x Motorcycle Velocity Stack 3 x Screws