Dual-walled Design:Polyolefin tubing outside and hot rings inside effectively waterproof performance and prevent wire corrosion. [Easy To Use] - Shrink 2:1. NO Crimping Needed. Transparent sleeve provides precise inspection when strip and insert wires inside. Color-coded tubing makes it easy for you to for use. [Durable Connection] - Tubing reduces in size and solder will and through the stripped wires, strong holding. Your wire will never slip out of the connector. [Wide Applications] - perfect used for vehicle, motorcycle, boat, DIY electrical wirings and other outdoor applications. Solder Connector Kit compliants with ROHS, ISO 9001:2008, SGS and standards. solder wire connectors:Whether you are working on your boat, vehicle, home or scientific project, heat shrink solder and seal connectors will solid soldering, increased current and weatherproof connections time~ Shrinkage 2:1 An easy One-Step Wire Connections. Easy Identification:Color coded connector tubing. Polyolefin heat shrink butt connectors Pullout Strength. High- wire connectors in Seal, Strain Relief, Cable Check and Insulation. Melted Solder ensures wires Strongly Connected and avoids wires slipping out from the terminal. colour:Yellow + blue + white + red Material:PE size:6x1x1CM Package Contents: 400*solder seal wire connectors(150*Red 150*Blue 60*White 40*Yellow) Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.