You have a choice of glass: 

• Standard Float Glass which is used for general framing projects
• Artglass 99 giving you 99% UV Protection (to help protect your work and stop it from fading)
• Water White Glass (often called invisible glass) because it is so clear it gives you the impression there is no glass present, this glass has both UV protection and some Anti-Reflective properties
• Acrylic – Acrylic is around 50% lighter than glass and much harder to break.
• Standard Anti-Reflective Glass