Applicability : To Connect two Telephone Wires, Data Signal Cables, and Other Conductors. Suitable Wire Diameter: 0.4mm-0.9mm Material: Plastic Casing, Gel Filled Inside Color: Yellow For cables 0.4-0.9mm Insulation:2.08mm Standard Connector / Crimper Gel Filled to protect from moisture Great for joining telephone / telecom wires Joins 2 wires with these ones