Usage Tips:waterproof wire connectors easy twist-on wire nuts to make secure electrical wire connections. Wire connectors include a cone shaped spring insert for making solid, stable connections to grab the wires firmly. Great for home, speaker, automotive, and residential wiring. Comes in a nice see thru plastic case making it easy to identify and store Cone shaped spring holds the wires firmly together;tight wire spring makes quick and secure connections. Easy to install,make the job quick and easy with no tools necessary. Assorted sizes for various electrical wire gauges, great addition to your electrical connector kit. colour:Photo Color Material:plastic Package Contents: 40 * Grey Min.2x#22 Max. 2x#16 40 * Blue Min.2x#22 Max. 3x#16 50 * Orange Min.1x#18/1x#20 Max.4x#16/1x#20 18 * Yellow Min.2x#18 Max.4x#14/1x#18 10 * Red Min 2x#14 Max.2x#10/2x#12 Only the above package content, other products are not included. Note: Light shooting 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.