Speedlock RZN core technology features an interlocking core design - the core's surface is similar to a waffle iron. This design helps the core connect with the compression layer surrounding it to form a tighter bond that helps improve the transfer of energy through the layers at impact.
The Speedlock core's interlocking geometry helps eliminate the slipping that normally occurs between a traditional, smooth-surface core and the outer layer. When a core slides or slips on impact, the ball loses energy and, as a result, speed and distance.
The lightweight RZN material allows the extra weight to the perimeter of the golf ball, which gives the new RZN family an extremely high Moment of Inertia (MOI) in a golf ball. This provides incredible ball flight stability in all wind conditions
Black and Platinum are four-piece balls, while Red and White are three-piece balls
RZN Platinum: Tour-level control with moderate spin (as used by Paul Casey on Tour)
Although I don't play golf I bought these as a gift and the balls look fine. I am surprised that the product description does not warn that they have a sponsor's name printed on them. In my case Worcester Bosch Group.
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