668nm Shortpass Colour Heat Glass Filter 25mmdia x 3mmthk
FS-CR Optical Filter Set
Colored Glass Filter, Optical Filter Glass, Blue Light Filter Glasses
Color Glass Filters
40mm Colored Filter for Spotlights - Red Dichroic Glass Lens | eBay
Fused Silica Wafers Dicing Service & Process, Glass Dicing Service
Colour filters
Optical Color Glass Cut off Filter Custom Bp Lp Sp Colored Glass Filters - China IR Longpass Filter Fused Silica Material Filter, IR Longpass Filter | Made-in-China.com