5mm lights have a very sharp light to them and are very focused and bright. The small size means fewer snags. They're great for branch-wrapping in Christmas trees, outdoor bushes, and outdoor trees.
 
Full Wave Pure/Cool White 5mm
LED Holiday Lights
100 Bulbs/String
green wire
UL Listed: YES
Dimmable: YES
Sealed Sockets: YES
Lights per String: 100
Light Spacing: 4 inches
Lead and Tail: 4 inches
Overall Length: 33.3 feet
Connect 27 Strings End-To-End
Wire Color: green