FORK CONNECTORS WITH HEAT SHRINK TECHNOLOGY - make instant water-resistant and corrosion resistant connections. INDUSTRIAL GRADE HEAT SHRINK TUBING - shrinks to 1/3 of its original size, and has heat activated adhesive that bonds the connector to the wire. INCREASED CONDUCTIVITY - pure copper terminals ensure highest current flow. Tin top-layer coating protects the terminal against corrosion. VALUE PACK - This kit includes heat shrink fork connectors that will last through numerous projects. LIFETIME WARRANTY - All Wirefy electrical connectors are backed by our best-in-class warranty.