Applied Energistics 2
The Quartz Fiber
The quartz fiber is used to share power between networks, while keeping them separate. This allows you to power subnetworks without needing to put energy acceptors and power cables everywhere. It can also be used to keep cables from connecting, although using cables of differing colors, or using Cable Anchor is cheaper and more effective.
They are cable subparts.
Recipe
Crafting
GlassWhite Stained GlassOrange Stained GlassMagenta Stained GlassLight Blue Stained GlassYellow Stained GlassLime Stained GlassPink Stained GlassGray Stained GlassLight Gray Stained GlassCyan Stained GlassPurple Stained GlassBlue Stained GlassBrown Stained GlassGreen Stained GlassRed Stained GlassBlack Stained GlassCertus Quartz DustQuartz Fiber