Village Lighting V-20599-C3 120' Green C9 (E17) Christmas Light Wire: A Revolutionary Light Socket. Christmas lighting 101 starts with your home's roofline. Our duckbill clip design will make installing your Christmas lights easier than ever with simple to use sockets that slide on your roofline in a flash. No more wasted time or having to agonize putting up your Christmas lights. Also includes water draining holes to keep sockets dry.