That grip is a 100% foam core, not an arbor. The shaped grip was poured and turned on a lathe, just like cork. Then a carbon fiber "skin" was applied and finish coated with a special epoxy resin. The end result is a substantially lighter grip than cork, a less expensive grip than even cheap cork, a MUCH more durable grip than cork or composite cork AND it is a very modern looking grip.
Personally, I prefer most of my builds with traditional cork with inlays - composite cork, wood, bone, fossil ivory, acrylic, etc.
However, it is always nice to know what is out there. Everyone has different tastes AND different needs. For example, the carbon fiber grips are terrific for pack rods due to the light weight AND beefed-up durability.
TJ -