V3 Gavel 25mm Quartz Banger. With a few improvements to the V2, the V3 has a larger opaque bottom with a thick layer of our 99.99% pure SiO2 opaque quartz with 2.5mm thick clear fused quartz walls and a 25mm diameter deeper bucket. The beveled edges on the top make for a great fit for most bubble caps and the rounded welds for 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.