Amazon.com : 2 inch x 18 inch, Mailing Tubes with Caps (12 Pack) | MagicWater Supply : Office Products
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