These solder seal wire connectors are great used for automotive, marine and some outdoor applications. It has reasonable insulated marine waterproof design, practical functions. Simple structure and excellent craftsmanship make it easy to use and have excellent durability, will provide you with good service.Features-Color: Blue.-Material:PE, tin.-Size: About4.00X0.70X0.70cm/1.57X0.28X0.28in.- Time saver. Solderless, crimpless, all you need is just a heat tool to finish the joint, much faster and easier than the old way.-Better waterproof and seal performance. There is waterproof design in each butt connector, which help it hold up better to moisture.-Use exclusive material in the butt connectors to avoid shrink tubing melting before solder ring.-Meet the standard required, which is the most standardized and safest way for you to repair or modify your car.-Good workmanship details, not easy to rust, waterproof, insulated, sturdy and durable, can serve you well.Packing list100 x Solder Seal Wire Connectors