The Global Specialties WK-5 Jumper Wire Kit comes with 100 pieces of #24 gauge, insulated, stranded copper wire. Each wire comes with gold-plated brass, pressed-pins on each end to allow for extended insertion life and maximum surface contact. The WK-5 is designed to work with Global Specialties trainers and solderless breadboards, Arduino, and Raspberry Pi. The WK-5 is UL approved and RoHS compliant.