Package Content: 16 PCS. of Bare Copper 4/0 Gauge (AWG) 5/16" battery terminal rings with 16 PCS heat shrink tubing. High Quality: Bare copper battery cable ends are made from 99.99% annealed copper,with a heavy duty construction for high temperature durability designed, special treatment surface for corrosion protection,good weldability. And enhanced mechanical strength can be crimped or soldered. Premium Wire Protector:The heat shrink tubing are made of polyolefin.The adhesive forms a robust, moisture-resistant marine grade waterproof seal that shields your connections from external factors like water, dust, and contaminants. Wide Applications: The copper wire connectors can be used for vehicle, automobile, motorcycle, distribution box, golf carts, solar panels, marine, home applications, DIY electrical wirings and other outdoor applications. Best Customer Service: If you have any problem with copper wire terminal connectors, Please contact us as soon as possible. We absolutely provide fast response and the best customer support. 4/0 AWG 5/16" Stud Heavy Duty Bare Copper Wire Lugs with 16Pcs Heat Shrink Tubing 4/0 Gauge Copper Ring Terminals Battery Cable Ends