By now, you’ve probably heard about the new glass roofing that’s on the market, but you may not know exactly what to expect from the material.

The new tiles are made of the same composite material as existing roofing, and they come in a range of different sizes.

The tiles are available in both square and circular versions.

The latter has the advantage of being lightweight, and it’s the only material that can withstand the harsh climates of many of the world’s highest mountains.

Here are five of the most popular options available.