Material: copper + zinc alloy, concealed door hinges are made of high quality zinc alloy material with rust and corrosion resistance. Before purchase, please check the size of the product to purchase the ideal size. Color: gold / silver . Size: as shown , opening angle: 0-180 degrees , style: modern/European/classical . Suitable for: wooden doors, folio doors, cabinets, closets, windows, etc. Features: easy to install, non-fading, ergonomic design Can be used for a long time. The whole hinge structure is stable, durable but not loose. Package included: 2 or 4 x concealed hinges with screws, Manufacturer: Shun Yingtong