These connectors are made from high-temp stealthy Black nylon with gold-plated spring pins or sockets moulded in. The shape of the XT90 prevents reverse polarity, and when plugged in the connection is super-solid. Perfect for applications up to 90A continuous current draw. . These versions use sheath housing, no need to use heat shrink tube, enhances overall performance in handling and durability. . 2 pairs of male and female.