The product shipped will match the color shown in the first image. Specifications and quantities are as described in the title. If you need to change the color or style, please within 12 hours after placing the order. Product Features: 1. Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified, including Part Number, Model Number, and inspection date information. 2. If you have any questions about the item, please provide the Manufacturing Part Number for verification; your satisfaction is guaranteed. 3. The piston set for air compressor 42 is made of metal. Piston diameter: 42mm, height: 36mm, aperture: 12mm, piston ring oil ring thickness: 3mm, gas ring thickness: 2mm, piston pin length: 34mm, diameter: 12mm, circlip: 13mm. 4. Suitable for air compressors. 5. Accessories include: 1 x piston, 1 x piston oil ring, 2 x gas rings, 1 x piston pin, and 2 x circlips. Specifications: Material: Metal Color: Silver and Black Name: BQLZR Size: 4.2 x 3.6cm / 1.65 x 1.42 inches (D x H) Piston diameter: 42mm, height: 36mm, aperture: 12mm, piston ring oil ring thickness: 3mm, gas ring thickness: 2mm, piston pin length: 34mm, diameter: 12mm, circlip: 13mm Weight: 83g Package Includes: 1 x Piston 1 x Piston Oil Ring 2 x Gas Rings 1 x Piston Pin 2 x Circlips Note: Due to differences in monitor models and display effects, there may be slight variations in color. Sizes are manually measured and may have an error of 1-2cm.