material: metal Package content: 4*a hidden hinge 1. High-quality materials: This hinge is made of heavy-duty copper, does not rust, and is sturdy and durable. And it can be used for a long time.2. Easy to install: The hidden hinge of the cabinet is simple to use and easy to install. This product contains 4 hinges.3. Easy to use: These invisible hinges are very convenient to use and install. The opening angle and unique design ensure a better operating experience.4. Application range: This hinge can be used for wooden doors, cabinet doors, light RV countertops or tables, and many DIY projects. 5. Ideal gift: You can use these barrel hinges to make your own box, as an ideal gift to your friends and family. Specification and weight: M12:67.64g/M10:46.08g/M8:19.84g Quantity: 4 Color: Yellow