High-grade Quality: We emphasize durability and value with our butt connectors which are comprised of copper that assures excellent conductivity. Wear resistant. Tin-coated to combat oxidation, enhancing long lasting performance in all environments. Versatile Use & Secure Connection: Our connectors assure a safe and reliable connection in varied fields of application like automotive, marine, and household industries. Perfectly suitable for battery cables, butt splicing and other electrical projects. Delivers maximum efficiency and minimal resistance. Sizes: it's convenient to find a connector that's a perfect fit for your wiring needs. This makes our non insulated butt connectors kit useful for a diverse range of wiring projects. and Convenient: The butt connectors and heat shrink tubes are designed to withstand rough conditions and temperatures. Easy application, all you need to do is strip, insert and crimp, the heat shrink tube will then add an extra layer of insulation and protection. note: Picture style, plastic box style random, Cannot be chosen the specific style. Material: copper colour: Black+Silver Package Contents: 40 x tube terminal 40 x heat shrink tube 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.