The Quantum line is one of the most technologically advanced bowling ball lines on the market. Crucially, each core is engineered to work specifically with the cover material and intended ball motion. The Quantum Evo Hybrid fits right in between the Evo Solid and the Evo Pearl with its unique shape and an intermediate differential of 0.018. The combination of the new QCS18 core with a 2000 Siaair hybrid version of our Evolution Reactive shell thus continues the "Quantum Evo" recipe for success.