Our binder clips are made of tempered steel, sturdy and strong to use, Assembled with steel arms, the clips provide an extra strong grip for your documents. Specifications: -No rust on papers - 50 pieces, black metal iron - 2.4"width, 1.3"Capacity - Binder clips and package are both reusable - Strong metal clamps with an opaque black finish - Keeps files bound together, prevents papers from slipping or pulling out - Tempered steel construction provides extra strong hold User: Everybody. Application: Hotels, Office, Schools, Restaurants, Stores and crafts.