The artsy, handmade Silca Sound 425 large Heavy Slide is hand blown with a tapered fit. The thickened end adds mass and has a colorful art design. The wall is 4.0mm thick, with an outer diameter of 30.0mm, and an inner diameter of 22.0mm. Length is 2.1". No two slides are exactly the same. The taper varies on each slide, some thicker, others thinner.