Proyo Yolsters were one of the coolest items to have back in the day.  Made of good plastic, these held either the regular shape or butterfly shape yoyo with a very good, tight grip and an integrated  belt clip.  While these were made by the thousands for the school program, not many exist anymore and some are in rare colors.  Gen 1 and Gen 2 models exist and are shown.  The difference between the Gen 1 and Gen 2 are strictly color variations.  Gen 1 were more muted colors whereas Gen 2 were more vibrant.
 
Check individual colors in the store for purchase options.
 
•  Rare meter  • • • • • 5/5
•  Condition meter  • • • • • 5/5
•  Estimated Value $10 - 15