V2 Gavel 25mm Quartz Banger. Has an opaque bottom, a 4mm thick layer of our 99.99% pure SiO2 opaque quartz on bottom with 2.5mm thick clear fused quartz walls and a 25mm diameter bucket. The opaque floor heats up much faster than traditional clear fused quartz, but can still hold heat well exhibiting wait times in excess of 80 seconds. The logo has been laser engraved into the joint. The chambered edges on the top are made to accommodate a better fit for most bubble caps. The opaque surface is slightly textured which assists in the formation of nucleation sites at lower temperatures. The material science, and surface science behind the Gavel are quickly making it an industry favorite. It is highly recommended to use iso alcohol to keep your opaque surface clean to avoid creating black spots.