3M Blue Heat Shrink Splice Connectors are designed for use with 16- to 14-gauge wire. They feature a heat-activated sealant that provides resistance against moisture. Each of the wire splice connectors allows easy insertion of wire ends and simple positioning. They can be used to join wire ends quickly and effectively. There are 16 connectors in each package. Keep them around for basic wire-joining projects where a reliable and water-resistant finish is needed. The 3M heat shrink connectors can be sealed using a heat gun.