JFT tyres are excellent. Wheels are well made, the glueing of the foam is very good and the compounds work well. Front wheel bearings fit exactly and the rears run true every time.
'C' foam is the equivalent of Yellow and Black Jaco - artificial rubber; 'A' Foam is the equivalent of Pink and Magenta-type tyres - natural rubber. In the UK we use 'A' foam - 30 rear (pink) and 32 front (magenta) on 13.5. If your club mainly uses yellow and black you'll need C foam. HTH