All of the Lace Dagger Tubes are made using first-quality borosilicate glass ranging from 5mm to 7mm thickness, with color rods, tubing, opals and dichro made in the USA. 303 sources all of the raw materials from highly reputable names in the American glass industry, including Northstar Glass, Greasy Glass, Hand of Man Tubing, Trautman Art Glass, ABR Imagery and Molten Aura Labs.