Great Material: Our light socket end caps are made of great quality plastic, which is strong and long-lasting, easy to screw in and out with knob design. Compatible Feature: The light bulb socket cover caps are only suitable for standard light bulb sockets (E26 sockets). Useful Tools: Our light socket safety cap plugs will work well to protect your string light sockets against bad weather, and prevent water or dust from entering into light sockets. Also the safety of electricity. They can be widely used for parties. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Black Material:Plastic Package Contents: 16x light socket safety cap plugs Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.