Come and see our amazing products. This keychain double as a tire pressure gauge is made of plastic and aluminum. This gauge allows you to save on gas mileage by keeping your tires properly inflated, it's workable to measure from 10 to 50 PSI. Easily carrying out makes it a great promotional tool for auto industry or car enthusiasts.It is ideal for product promotion, corporate promotion and incentives, and can be printed on products with brand logos. Pls confirm with us about the packing info, stock color and exact production time before placing your order.