This is XT60 LiPo Battery Cap, Protective Cover, (5-pack)
Protect your batteries in style with Venom XT60 battery cap protective covers. These handy caps are easily fitted to an XT60 battery connector and provide extra peace of mind when storing and transporting batteries, reducing the chance of short circuit. Made from PE plastic and sold as a set with 5 pieces. Compatible with XT60 male battery connectors including the Venom UNI 2.0 XT60 connector.