GRAV uses the finest borosilicate, a type of glass with a high silica content that’s heat-tolerant and chemically inert. These qualities make borosilicate perfect for pipes, as it can withstand and disperse heat from a lighter or torch and doesn’t pollute smoke in any way. Some of our components, namely our nails and bangers, are made from quartz. Quartz is 100% silica, making it even more durable than borosilicate. However, it’s more expensive than borosilicate, which is why we only use it for smaller pieces.