Iron Flat Head Pins,Nickel Free, Mixed ColorSize: about 50mm long, 0.7mm thick(21 Gauge); about 500pcs/100g, Head: 2mm.A jewelry-maker's staple, Flat Head Pins allow you to make earrings, pendants, links and drop embellishments faster than lightning. Caused by the property of material, pins may be bent but that won't impair their use.