These male and female connectors are made of high-temp nylon material, finely designed for long lasting performance, they possess good electrical conductivity.
Safe and reliable: the nylon XT30 plugs have better contact surface area which can handle 20a current for extended periods.
These are great for a quick disconnect plug for tweeters or LED lights. 
Sold as single(one male, one female). Or as a pair (two male, two female)