Seven Sins Choppers Stash/ Registration Tubes are all individually handmade. Each unit is about 6" long w/ a sleek 6" Tall x 1" Diameter (1/8 thick wall) clear glass tube. Each tube is held together in a vintage style with two beautifully lathed 6061aluminum caps and a brass bar threaded on both ends for tightening the caps brass acorn nuts (mounting tabs included). There is a black 1/16" neoprene washer between cap and tube for moisture and vibration resistance.  Made in USA.