The Global Specialties WK-4 Jumper Wire Kit contains 100 pre-cut premium #24 gauge insulated stranded hookup wires. Each wire comes with specially-designed, machined pins soldered to each end to allow for extended insertion life and maximum surface contact. Use the WK-4 for prototyping wire connections. It is specifically designed for use on Global Specialties trainers and all Global Specialties Solderless Breadboards.