Valtryek V2 - Beyblade Burst(2016)

Forge Disc - Boost Boost is a circular Forge-Disc with six small downward sloping blades present around its perimeter. In theory, the blades are meant to produce Down Force in Right-Spin to increase the grip of the Beyblade on the stadium floor by pushing air downward and create Upper Force in Left-Spin which would decrease the friction between the Beyblade and the stadium floor by pushing air upwards. In reality however, due to the small size of the blades, the Down/Upper Force created is negligible and the said blades serve no other purposes other than drastically reducing the Life-After-Death of Boost. Furthermore, Boost has a light weight even for a non-Core Disc and a poor weight distribution making it a poor choice for Attack, Defense and Stamina Combinations. Source: https://beyblade.fandom.com/wiki/Valtryek_V2_Boost_Variable