Top quality 3.75 inches wide, gives much better road holding. Can be used with a 3.50 350 x 10 or 100/90 x 10 tyre. Please note: There may be a small gap between the 2 rims when bolted together, this will not affect anything other than aesthetics, but if you are bothered than please take this into account.
 
Top picture shows a standard rim compared to the wider type.