Sleeve.

[gtfreight]

I have seen that many people make sleeves to lessen the twang from cut to size beer cans.
I would like to try something that's not homemade.
The dimensions I need are 22mm o/d x 21mm i/d x 170mm length. I have looked on the internet and the nearest I can find is carbon tubing but the thinnest wall is 1mm which brings the i/d down to 20mm.
I even went round the supermarket and B&Q with my vernier gauge measuring anything that looked anywhere near my requirements (I got some odd looks when measuring vitamin pill containers, mop handles etc).
Does anyone know of a manufacturer that makes tubing of this size or even if this is an avenue worth going down?