1. Material: aluminum alloy + 304 stainless steel
2. Pressure: constant 30 pounds
3. Style: flat base/threaded base
4. Sturdy and durable material, not easy to corrode and rust
5. Ergonomically designed handle for comfortable grip
6. 30-pound spring ensures constant pressure and saves time in making coffee
7. Size: 51,mm, 53mm, 58mm