44 Clash is an annual event in Japan promoting yo-yo freestyle. This Freehand Zero was released to commemorate the 5th Annual 44 Clash in 2012. Besides being a classic Zero, this one also shows interesting modifications.
While you find many of these modified yo-yos, it is difficult to determine who did the modding. This one looks to me that it is possibly an SKon mod. Notice the work around the bearing and response by silicon or response pads is possible. Also, a channelized bearing, larger than the standard bearing was added. Probably a Dif-e-Yo bearing. If you have more info on this mod, please let us know.