Amazon.com: Stainless Steel 304 Round Tubing 1-1/2" OD x 44" Long, 18 Gauge : Industrial & Scientific
Amazon.com: Rubber Tubing, Latex Rubber Tube 0.4 inch (9mm) OD 0.2 inch (6mm) ID Highly Elastic and Strong, Speargun Band Slingshot Catapult Surgical Tube Natural Rubber Hose, 1 Meter : Industrial & Scientific
Amazon.com: stainless steel tube OD 24mm ID 18mm 17mm 16mm stainless steel 200mm length (OD24ID14) : Industrial & Scientific