This is an excellant set of rims. The offset available to you is either +2mm or +10mm, depending on which side of the rim you secure the inner mesh. Yes, I have said it, there is another option of an offset of 10mm. (TEN) : )
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 10mm of offset.
I am using this rim with the Tamiya wide super grip radial, 53231. Excellant combination. Highly recommended.