The +3mm weighted hex extender for the Trx4-m weighs in at 9 grams and adds 3mm of extra wheel offset for a wider +6mm total stance. Get a little bit more weight and extension to help keep you planted and reduce roll overs. 

These will fit stock wheels or other plastic wheels, They may fit with aftermarket wheels or may require you to drill the wheel nut holes in the wheels out slightly larger. The short barrel nuts will need to be used with locktite.