Bowler Ratings


Bowler ratings are from 1 to 10 in order of Stroker (ST), Tweener (TW), Cranker (CR)

Note: Ratings are only available to our premium members.

General Info

Name:Black Pearl Urethane
Reviewed:April 2024
Coverstock Specs
Name:Urethane Pearl 78D
Type:Urethane Pearl
Box Finish:500 SiaAir
Color:Black Pearl
Core Specs
Int. Diff:0.000

For details on our standard test layouts, please click here.

The Black Pearl Urethane is Hammer’s latest response to the new 78D hardness rule for the PBA Tour. This ball is harder than the Purple Pearl Urethane, creating more length and less total hook. To make up for the change in coverstock, the box finish is rougher on the Black Pearl Urethane compared to the Purple Pearl. This ball uses the same LED weight block as the Purple Pearl, NU Blue, and Purple Solid Reactive, giving it an RG of 2.650″ and a differential of 0.015″. As expected, the Black Pearl Urethane excelled on our dry test pattern, and Cranker’s high rev rate gave him the most versatility out of our three testers.


Cranker had the best reaction of our three bowlers on the dry test pattern. His higher rev rate allowed him to shape this ball more and gave him slightly better pin carry than the other testers. He could swing this ball farther right and still get it to recover on this shorter pattern, but he needed to make sure to start the ball far enough right so that he had hold left of his target as well. As oil carried down, he needed to reduce his ball speed and increase his axis rotation in order for the ball to keep shaping up. Further along into transition, he needed to move farther right as more oil was pulled downlane. Changing into a less aggressive resin ball was also an option later in the session.

Cranker easily had the best reaction on the medium oil pattern. He could strike with ease on the fresh, playing a slightly tighter line from farther outside compared to the line he used on the dry pattern. Due to the increased oil on the lane, he had to wipe the cover down before every shot. As the lane started to transition, he needed to

Additional Hammer Black Pearl Urethane Resources

Click here to visit Hammer's website to read the manufacturer-supplied information on this ball. Also, see below for the manufacturer-produced promotional video for this ball.

Please remember that our reviews are solely based on our own testing and that you may sometimes find differences between our comments and ratings and the manufacturer's claims. Links to these manufacturer resources are provided here strictly for convenience purposes.

The BTM Ball Testing Team

About The BTM Ball Testing Team

The BTM Ball Testing Team is led by Eric Martinez. Our team of three testers has thrown and reviewed hundreds of bowling balls for Bowling This Month. When not testing balls for BTM, Eric owns and operates University Pro Shop in San Antonio, TX and he is an avid competitive bowler. Click here to learn more about how we test and review bowling balls.