Description: Made of high grade copper material which is durable, sturdy, anti-corrosive. 2 sizes single barrel crimp sleeves and 3 sizes double barrel crimp sleeves mixed. Nice for mono, wire leader, making trolling and bottom fishing rigs. Easy to crimp, compresses consistently without cracking. Specification: Material: Copper Length: approx.1cm / 0.39inch Single Barrel Crimp Sleeves Diameter: 1.6mm/2.0mm Double Barrel Crimp Sleeves Diameter: 1.2mm/1.4mm/1.8mm Package Includes: 500 Pieces Fishing Crimp Sleeves(100pcs for each size)