You can easily fasten both commercial-grade and standard-grade lights to buildings and trees with these tie wraps. They can be used with C-7 Lamps, C-9 Lamps, and Mini Lights. The ties work for both standard Incandescent and LEDs. Each tie is 4 inches and the white color is designed for use with white wire. Come in bags of 100. They are good for both indoor and outdoor use.