The Banger is a 25mm, flattop quartz banger. It is imported. It features a beveled edge along the flat top to allow for an optimal seal with a carb cap/bubble cap. Every joint is frosted (grounded) to create a nice seal, when seated properly inside a 10mm or 14mm joint. The welds are very clean. The flat bottom portion of every bucket is 4mm thick. Each quartz banger comes inside it's own plastic display case.