Description: Quality: The piston is made of rubber, which is resistant to high temperature and fatigue. Protecting the Air Pump: The contact objects are not easy to wear, and the piston the air pump has a long service life. Ease of Use: The piston maintains shock resistance and low noise, making to use. Compressor Accessories: Piston rings can be used free cylinders pump compressors, etc. Lightweight: Lightweight and practical, it can meet daily replacement needs and be used with confidence. Specification: Material: Metal, Rubber Size Chart: 63.5mmx69mmx24.5mm/2.50inchx2.72inchx0.96inch Package Includes: 1x Piston Rubber Ring 1xAir Compressor Cylinder Sleeve Note: Please allow slightly errors due to manual measurement and different monitors.