Mattel hoverboard
From Futurepedia, the Back to the Future Wiki
The Mattel hoverboard was a brand of hoverboard by Mattel available in 2015. Mattel sold a pink version for young girls to ride with the assistance of a handlebar and a strap.
Marty McFly borrowed a Mattel hoverboard from a little girl riding one on Courthouse Square and used it to flee Griff Tannen and his gang. The little girl would eventually let Marty keep it, after she gained the Pit Bull hoverboard from Griff while he was being arrested. Marty would then continue to use the hoverboard in 1955 to retrieve the Grays Sports Almanac and in 1885 to save Doc Brown and Clara Clayton from falling off the locomotive that would push him back to the future.
Doc caught the hoverboard's strap with his foot and caught Clara as her dress ripped. Doc and Clara hovered away from the tracks and the ravine to safety. It is unknown what happened to the hoverboard afterward, but it is assumed that Doc still had it in his possession.
