Bandai's "HyperCluster MB2-S3 Sleeping Edition" bearing set released July 23, 2011. This particular date was the apex in the HyperCluster series and its popularity. The greatest number of yo-yos (2), bodies (14), and bearing sets (2) were introduced by Bandai.
This particular bearing set was considered an upgrade bearing to replace the lower grade bearing systems that came stock with most HyperCluster yo-yo sets. It was designed to give you long yo-yo sleeps. The bearing itself is size K and came with two metal spacers to increase the yo-yo's gap, thereby making it unresponsive.
The HyperCluster series took the ease of yo-yo customization to a whole new level. The back of the package shows you other configurations you could build using compatible bodies, core parts, and bearings from other HyperCluster-series yo-yos.
Came with one metal size K bearing, (MB2), two metal spacers (S3), and customization guide.
