From the Boise Woodworks website:
"Made from maple with 12 ebony wood circles on each side. This ball bearing yo-yo is shaped in the classic standard style. Silky smooth to the touch, the yo-yo has an all natural finish of mineral oil followed up by a buffing with carnuba wax. The yo-yo is approx. 2-1/4ā€¯ diameter [57.15 mm] and weighs 2.6 ounces [73.71 gm].
The most popular yo-yo's these days have a ball bearing spindle instead of a fixed wood or metal post. Yo-yo's with a ball bearing spindle spin longer, sleep better and make it easier to perform complicated tricks. The yo-yo will screw apart so that you can replace the bearing if needed. The bearings diameter is 8 mm. The shaft has a 4mm diameter and is 33mm long."
While visually appealing, the weight of this yo-yo (about 15-20 grams too heavy) makes most string tricks too difficult to make it a practical, everyday yo-yo to play.