Y-Core, The Chinese entrant to the LD shaft world. I have one, it's kind of the "most deflection" of the ld shafts that I've ever used. Not to bad really, kind of a step between a regular shaft and an ld shaft. If you're thinking of a Jian Ying cue you'll probably want to change the tip right away, the majority of those tips that I have received on those cues are kind of about the consistancy of a rock, the cue is nice looking though