K & S 1115 Round Aluminum Tube, 5/16" OD x 0.014" Wall x 36" Long, 4 Pieces, Made in The USA: Metal Industrial Wall Tubing: Amazon.com: Industrial & Scientific
Amazon.com: K & S 9315 Round Aluminum Tube, 3/8" OD x 0.035" Wall x 36" Long, 4 Pieces, Made in The USA : Industrial & Scientific
Amazon.com: uxcell 6063 Aluminum Tube, 4mm 5mm 6mm OD x 1mm Wall Thickness 300mm Length Seamless Round Pipe Tubing, Pack of 3 : Industrial & Scientific
Amazon.com: One Aluminum Storage Tube - 3.85"x1" - Assorted : Beauty & Personal Care