This is an excellant set of rims. The offset available to you is either +2mm or +4mm, depending on which side of the rims you secure the inner mesh. Yes, I have said it, there is another option of an offset of 4mm.
This is a 2 piece rim and using 5 screws (supplied) you secure the 'gold mesh' part to the 'chrome' rim. Securing it from 1 side, gives you 2mm offset and securing it from the other side, you instantly have 4mm of offset.
I am using this rim with the Tamiya super grip radial, 53214. Excellant combination. Highly recommeded.