The Mosquito is Duncan's first undersized ball bearing yo-yo, released as part of the Hardcore series in 2005. It was designed with a low price point in mind of under $10 USD. The body featured a translucent plastic with opaque non-removable caps in the initial versions. Later versions feature removable caps, held in place by screws. The Mosquito features a response system consisting of friction stickers overlapping small starbursts. This gives the user a choice of using just the friction stickers, the starbursts, or a combination of both.