The smallest I stock is 1/16", it's worked well for #28 and 30 wiring.  However, the size of the wire is all important, what's the diameter of the wire with insulation.  Obviously, the tubing has to fit over that before shrinking.

Choosing the Right Heat Shrink Tubing Product for the Job

I use this 3/64 tubing from mouser.com in most of my repair projects (radios, amplifiers, trains)! Fairly cheap 100ft for $7.20! Description and part number :

Heat Shrink Tubing and Sleeves 3/64 100FT MINI SPL

<label for="MouserPartNumFormattedForProdInfo">Mouser #:</label>
562-Q2F364-MS100

 Cheers Don

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