- NU Blue Hammer

First Impressions
The Hammer NU Blue Hammer marks a significant technological development in bowling, having been developed as a direct answer to the tightened PBA hardness regulations. Visually, the ball shows up in a striking "Bad Ass Blue Pearl" color scheme, and the rough 500/1000 Siaair Micro Pad factory finish immediately reveals an aggressive texture. The heart of this ball is the new "Not Urethane" (NU) coverstock. This is a chemical innovation designed to simulate the classic performance characteristics of urethane without actually using urethane components. Inside works the proven symmetrical LED core, which was already used in the legendary Purple Pearl Urethane. With an RG of 2.586 and a differential of 0.027 (at 15 lbs), the technical configuration points to an extremely controlled ball reaction. The combination of this proven core and the new shell technology should give bowlers the security of a urethane ball while at the same time taking advantage of a reactive surface when it comes to displacing oil.
Comparison
The most important reference point for the NU Blue Hammer is without question Hammer's Purple Pearl Urethane. In a direct comparison, the NU Blue Hammer shows a striking similarity in its motion, but differs in crucial nuances of ball physics. While classic urethane tends to push oil into the dry parts of the lane (carrydown), the NU surface absorbs the oil much like a reactive ball. That produces more consistent friction, even when several bowlers are playing the same line. In terms of lane reaction, the NU Blue Hammer reads the heads about as early as its urethane predecessor, but creates a somewhat more defined arc in the back part of the lane. It isn't as angular as typical reactive balls, but it offers more continuation through the pin deck than pure urethane. Compared to stronger reactive balls, such as Hammer's Black Widow 2.0 Hybrid, the NU Blue is considerably earlier and rounder, which effectively minimizes overreaction off the dry outside boards. It thus closes the gap between true urethane and the weakest reactive balls (such as a weakly drilled Rhino from Brunswick), while performance-wise it stays clearly closer to the "urethane look."
On the Lanes
The ideal application for the NU Blue Hammer is on short to medium-length oil patterns or on lanes with heavy friction on the outside. It is a specialized tool for situations in which controlling the hook matters more than simply creating angle. If you have a high rev rate (two-handers included) and often struggle to control ball motion on fresh or inconsistent lanes, you should benefit from how it smooths out the ball's shape. When the transition sets in and conventional reactive balls react too sensitively to the change from oil to dry, the NU Blue Hammer offers a reliable option for continuing to hit the pocket in a controlled way. Another advantage is the improved carry compared to traditional urethane: because the ball often hits the pins flatter thanks to its energy retention and entry angle, corner pins can be cleared more effectively. It is less suited to very long patterns or high oil volume, however, since it lacks the necessary aggressiveness in the backend to fight its way back out of the oil.