EXCELLENT SERVICE, the website promised 2-4 day delivery, but it ARRIVED AFTER ONLY ONE DAY. THE PRODUCT IS AS ADVERTISED. As Charlie Norton says it's very round, and very white, but as for sounding like Darth Vader, I still had to employ James Earl Jones for my fancy dress party because the pipe didn't fit inside the helmet. The reason I wanted 5" pipe (after years of looking) is that it is ideal for a 1/24th scale Titan II ICBM. I thought about building the 9 megaton warhead, but even at 1/24th scale I thought it might singe the carpet if it accidentally went off. So I settled for a old an Revell 1/24th kit of a NASA Gemini capsule instead.
PS. Apparently you can also use this pipe for ducting as well.