This player who manipulates dice and yo-yo quickly is Denny Ko Kwan Ho. He is a C3yoyodesign sponsored member. He got the second place in 5A Division at CNYC (China National Yo-Yo Contest).
He uses a DarkStar. And, of course, it is made by C3yoyodesign from Hong Kong.

>>C3yoyodesign Presents: Denny Ko Kwan Ho - 5A Boring practise with DarkStar.