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
HYTONE Natural Rubber Latex Tubing - The Hygenic Corp.
Amazon.com: ADAMAS-BETA Latex Rubber Tubing 1/4" ID x 3/8" OD Surgical Tubing Speargun Band Slingshot Catapult Tube Industrial Tubing for Laboratory Hospital Home, 26.25ft Length : Industrial & Scientific
Fisherbrand Natural Rubber Latex Tubing on 50ft. (15.2m) Reel:Pumps and | Fisher Scientific
GSC International TUBING-1-4-12 Latex Tubing, 1/4 in. ID, 3/8 in. OD, 1/8 in. Thick, 1 Foot - Walmart.com