The C6 bulb shape is slightly larger than M6 bulbs. They disperse the light well by having a larger lens. These lights are best used in larger bushes and trees, Christmas trees and outlining lower rooflines.
 
Full Wave Blue C6
LED Holiday Lights
50 Bulbs/String
green wire
UL Listed: YES
Dimmable: YES
Sealed Sockets: YES
Lights per String: 50
Light Spacing: 4 inches
Lead and Tail: 4 inches
Overall Length: 17.5 feet
Connect 60 Strings End-To-End
Wire Color: green