19.5 x 10 G25 Compound (4) PT1171G25 Slot.it

DWG 1171 size  - G compound tyres for 15.8 and 16.5 x 8mm Slot.it hub and similar wheels.
Soft rubber compound that suits most plastic and wood tracks.
These G series replace "F" Series tyres going forward, and true quite easily. 
Lathe truing can be done without causing "balling up"
Polish off with fuelite or lighter fluid for a shiny finish if your club and race rules allow it.

Approximate diameter on hubs prior to trueing

15.8mm hubs  19.7mm
16.5mm hubs  20.3mm
16.9mm hubs  20.6mm
17.3mm hubs  21.0mm