Product name : Compression Fitting Ferrules, design : tube Type ,Material : High quality copper, silver plated, anti-oxidation, anti-corrosion. Features:Great for car amps & battery terminals.use these to clean up the look in engine bay and amp connections.Works perfect with amplifiers that take a direct wire input. Installation Method: makes a clean install a breeze when used with hydraulic crimpers. Keeps from having stray strands hanging out and makes adapter use alot easier. It will also save your wire from getting chewed up from set screw. These kit took the cleanliness of installs to the next level. Won't ever install an amp without ferrules again. Material:copper colour:Silver Package Contents: 120 x EN25-16 7.5mmX16mm (AWG 4) wire copper crimping connector 120 x EN16-15 5.8mmX15mm (AWG 6) wire copper crimping connector 120 x EN10-15 4.5mmX15mm (AWG8) wire copper crimping connector 120 x EN6015 3.5mmX15mm (AWG10) wire copper crimping connector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.