SINCE 2001!! Boston CraftWorks is the most comprehensive site on the internet for kaleidoscope kits and parts for hobbyists, artists, students and everyone else! We have other crafts too!
Solid brass tubes - very strong - 1mm thick. You can stand on these and they don't bend at all. 3 inches long (1/2 inch diameter , 6 inches ong (1 inch diameter), 9 inches long (1.5 inch diameter) and 12 inches long (2 inch diameter).