What is the difference between C7 and C9 Christmas Bulbs? – Christmas Light Source
C7 Projector Series™ SMD LED | Village Lighting Company
Multi-Color LED Christmas Light Bulbs | C7 C9 | Shop | Lee Display
Amazon.com: C7 Christmas Lights,25Ft Vintage Christmas Lights with 27 Colorful C7 Bulbs (2 Spare) for Christmas Lights Outdoor Indoor Party Backyard Wedding Christmas Decorations Multicolor : Home & Kitchen
Pallerina C7 LED Christmas Lights 25Ft Multicolor Christmas String Lights Outdoor with 27 Ceramic LED Light Bulbs, LED String Lights for Christmas Tree Decor Patio Carnival, E12 Candelabra Base - Amazon.com