An unusual release of the venerable, plastic Duncan Butterfly. Enclosed in the bubble card were 3D stickers and 3D viewing glasses that you could use to view the stickers and also go to the website http://3d.yo-yo.com to view yo-yo tricks in 3D. The 3D yo-yo trick website, sponsored by Duncan, was still live as of January, 2019 (September 2020 update: the website, unfortunately, no longer exists). To my knowledge this is the only yo-yo package ever released that promoted the viewing of tricks in 3D.
A 3D edition of the Duncan Imperial was also available.
