The Pro-Z from Duncan is a unique product, essentially two yo-yos in one - it starts out as a standard "modified" shape, with starburst response. Packaged with this yo-yo are Duncan's new MOD Spacer technology which lets you insert special spacers that turn the Pro-Z into a wide Butterfly shape, with Duncan's Friction Sticker response. The MOD spacers can also be used in other Duncan yo-yos like the Freehand Zero to make them super-wide.
