Most of our samples come in four main sizes S, M, L, XL and are made using 6mm low iron glass. Please note that due to the nature of glass processing limitations, certain glass sizes are not possible to toughen or edges cannot be polished. The samples are designed to demonstrate colour rendering on the back of the glass as close as possible as it would appear in your kitchen. Small samples are supplied non-toughened in a presentable package designed by CreoGlass. Largest samples are supplied toughened with polished edges.