YOPINK binder clips are made of tempered steel,durable and reusable, assembled with steel arms, the clips provide an extra strong grip for your documents.Ideal for home, school and office supplies. I believe it will be the product you need. Product Information: 1. ASSORTED SIZES: Large binder clips: 1-1/4 inch width, 3/5 inch capacity, 5 pack; Medium binder clips: 1 inch width, 1/2 inch capacity, 10 pack; Small binder clips: 3/4 inch width, 1/3 inch capacity, 45 pack; Mini binder clips: 3/5 inch width, 1/5 inch capacity, 40 pack; 2. All paperclips in a transparent box, convenient for store and fetch. 3. COLOR: black 4. Package Size: 4 x 4 x 3.4 inch; Weiht : 10.7oz. Product Features: 1. No rust on papers. 2. Tempered steel construction provides extra strong hold. 3. Keeps files bound together, prevents papers from slipping or pulling out. 4. Binder clips and package are both reusable. Application: Purpose: Everybody. Place: Hotels, Office, Schools, Home and Crafts.