Copper Compression CTAP, Thin Wall, No. 6 - No. 4 AWG, For copper-to-copper tapping, splicing or pigtailing, Color-coded for proper crimp die selection, Ribbed design provides high strength, Made from high conductivity wrought copper, UL Listed and CSA Certified to 600 V and temperature rated to 90 degrees celsius when crimped with Panduit and specified competitor crimping tools and dies.