JoyTubeNatural Latex Rubber Tubing, 8mm(5/16") ID x 12mm(1/2") OD 3 Meter Surgical Tubing for Home Hospital Laboratory Speargun Band Slingshot Catapult Hose Tube

Was a great product as far as I know and has worked great for whatever I have used it for, but I think I should have ordered a slightly skinnier size....that's on me! Not the the manufacturer or the shipper

This stuff has millions of uses. When I was little, my cousins made fabulous, slingshots and crossbows out of it. And later we used it to restring our spearguns. This product makes a great replacement for springs that make way too much noise.

I don't know what the gold standard is for tolerances of latex tubing, but this stuff seems a bit on the fast-and-loose side. I got the 10 mm ID x 14 mm OD. Measured the ID to be 10.5 mm one direction and 11.5 mm the other because the wall thickness isn't constant all the way around. I needed this to fit over a 3/8" barb on one side and a 10 mm barb (practically the same size, 9.525 mm vs 10 mm) on the other and both are loose. Going to try and clamp it because it's not a critical application, minimal water pressure (a few psi), all it has to do is not leak. OD was 14.2 mm in the narrow direction and 15.4 mm in the wide direction. I measured at each end of the tube and both have an oval / egg shaped profile with similar oversized dimensions so I assume it's consistent throughout the length (there looks to be a twist in the cross section but I'm not sure if that's an artifact of how it was rolled up).

The hose is very elastic and returns back to size. I bought the 8mm(5/16") ID x 12mm(1/2") OD 3 Meter Surgical Tubing.