Definitely do not order these rims. These rims are 36 hole rims while Brompton uses 28 hole. Furthermore, these rims are likely 305mm rims which are smaller than the 349 rims which Bromptons use.

You should order Brompton rims:

https://www.perennialcycle.com/bromp...-349-3014.html

I would think twice before you let your friend rebuild your wheels as he recommended the wrong size rims and the wrong number of holes.

Good luck.