Product description dubbed the ball that loves to spin on its introduction the mp s is mizunos softest most responsive ball the 2015 edition maintains that trait whilst adding the dimension of increased long game distance refined urethane cover reduced to 0 5mm thickness for increased initial velocity 330 dimple pattern configured for more stable ball flight 3 piece construction adapted for high ball speeds and responsiveness the 2015 edition features a larger inner core and thinner uret