The Screw Ball Mini was made by Tomy in 1998. It was one of the first transaxle miniature yo-yos and was only available in Japan. The Screw Ball didn’t have ball bearings, but the plastic sleeve worked great. In fact, I believe the Screw Ball played better than most of the ball bearing minis that came out 3 years later.
Hironori Mii (offstring world champion and founder of Team Off-String) once told me that in order to achieve the highest level of Team Off-String, a player had to do all of the team’s offstring trick list on a Screw Ball. That is hardcore, but of course the guys from T.O.S. were freakin’ hardcore as well.