I think those were made by Dunlop. Not sure though. Someone will chime in.
Not my favourites. Plenty strong but they are not positively located. They "centre" on the extra thick mounting nuts, not a great system. If you are vibration free, no worries. If not, a couple of points:
Before installing, locate them first with two steel wheel tapered nuts. Then fit and tighten the proper nuts.
The wheel centre is not machined! To balance the wheels properly, get it machined or use a bolt-on balancer adapter (using above technique).