IMHO, it really depends on your personal preferences. I don't like a big fat soft grip, but nor do I like the smaller harder grip (I had some ODI Lockons which were very small and hard thinking they would be really good, but I absolutely hated them -it felt like my hands were being bashed onto concrete everytime I rode. Best thing I ever did was giving them away to a friend). Interestingly, I've not had enough problems with grips moving to warrant locking grips. Thoroughly cleaning the grips and the bars seems to keep them in place for me.
So to answer your question -don't know as they are the grips that came standard with my Giant Trance -probably some Giant own brand thing. If they are comfortable, I just forget about them.