The video description says it better than I could:
This is a “Girl Power” collaboration video between C3YoYoDesign and CLYW, two decent yoyo manufacturing companies. Starring Julia Aleksandra Gutowska and Ewelina Wejner (also known as Nuu Gatowsky), both using C3xCLYW H5Chief! Enjoy! HYPE THEM BOTH FOR EYYC 2013 FEMALE DIVISION!! GOOD LUCK GIRLS : *
Recorded with Canon 600D & GoPro HD Hero 3 Black Edition.
Edited with various Adobe software by Adam Paszke (Media Producer) & Mihai Suster (Edit and Video Assistant)