Quantum feels bad for FH, I would say it's designed for BH ONLY, though sponge is 50°
Sparsely pimples and soft surface of rubber,great contact can do lot of spin
you will feel every contact all the same,same spin same speed and same angle with low power,unless your smash can press into the 50° sponge,then the ball upgraded to next level with horrible speed and spin.
Fit for ALC blades such as boll-ALC,viscaria, ok with DHS W968 & 506, but maybe not fit for hino blade? garaydia T5000?