The ball lock post is made of stainless steel, and it is safe and non-toxic. You can install it on the beer barrel. The ball lock post can be used repeatedly and durable for long time use. Specifications: Condition: 100% Brand New Material: Stainless Steel Color: Silver Weight: approx. 124g/4.37oz Features: Made of stainless steel, safe and non-toxic, odorless and anti-rust. It is applied to connect other accessories, such as: O-shaped ring, poppet valve, pipe and nut. Easy to install: easy to install the ball lock post, just screw tightly the ball lock post. Reusable and durable: the ball lock post can be used repeatedly and durable for long time use. Comes with the 2 ball lock posts, and it can meet your need. Package List: 2* Ball Lock Posts Note: 1. Please allow 0-2cm error due to the manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. The ball lock post is suitable for coming air and the overflow water Made of stainless steel, safe and non-toxic, odorless and anti-rust Comes with the 2 ball lock posts, and it can meet your need Reusable and durable: the ball lock post can be used repeatedly and durable for long time use Easy to install: easy to install the ball lock post, just screw tightly the ball lock post