Glow Collection Round 2 uses an all new White Glow material that looks opaque white to the eye, but glows super bright when the lights go out. For years, YoYoFactory has dreamed of a yo-yo that offers the benefits of hubstack technology in a form that any yo-yo player can use, affordable cost, responsive performance, and a new and improved shape. Hubstack offers all of the above and more! Out of the box, the Hubstack is 100% responsive, meaning that any yo-yo player can use it. With the YYF patented hubstack technology, you don??t even need to throw the yo-yo to get it started! Just hold the hubstacks, give the string a pull, and feel the gyroscopic power! Best of all, the Hubstack is upgradable to unresponsive performance with the addition of a large SPEC or Center Trac bearing.