This 50-Pack of RJ45 Modular Male plugs with gold-plated contacts is for use on Solid or Stranded Conductor Cat5e cable. Contacts are 50 micron gold for optimum signal transmission.Problem it solves: Feel up to crimping your own Cat5e cable? You're gonna need some of these. Quality plugs-great price.4XEM gear is respected industry wide for its high performance, premium quality and durability.