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Hammer Blacklist specs
The Hammer Blacklist is a pearl reactive ball with the Stacked LED core. Here are its published specs, how they compare with the other current balls in our table, and what the numbers mean on the lane.
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| Coverstock | HK22 - Cohesion Pearl |
|---|---|
| Cover type | Pearl reactive |
| Core (weight block) | Stacked LED |
| Core type | Not stated |
| RG | 2.545 |
| Differential | 0.047 |
| Factory finish | 500, 1000, 1500 Siaair / Factory Compound |
| Maker's category | Upper Mid Performance |
| Color | Black Pearl |
| Weights | 16-12 Pounds |
| Release date (maker) | November 19, 2026 |
| USBC approved | 13 October 2026 |
Numbers as Hammer publishes them, checked 21 October 2026. Published for a 15-pound ball. Drilling changes how a ball behaves, so a pro shop's layout matters as much as these numbers.
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What the numbers mean
RG 2.545. That is lower than 14% of the 134 current reactive and urethane balls in our table, so it sits on the high side. Storm says "a high RG ball delays its revving, offering more length and angular motion down the lane."
Differential 0.047. Higher than 50% of the balls in our table. Storm says "a high differential ball will create a sharper angle of entry into the pins."
Pearl reactive cover. Pearl covers skid farther before they hook; bowling.com calls them best on medium to dry lanes, and Storm ties them to dry conditions.
USBC allows an RG from 2.447 to 2.813 inches and a differential of at most 0.060 inches (Equipment Specifications Manual, March 2026). Our ball spec table lists every current ball we track, and who makes bowling balls covers which company owns Hammer.
Balls with similar numbers
Same cover type, closest RG and differential in our table:
- Brunswick Crown Victory Pearl: RG 2.540, differential 0.045
- Storm Next Factor: RG 2.540, differential 0.050
- Storm Rocket A.i.: RG 2.520, differential 0.046
- Brunswick Strategy: RG 2.509, differential 0.047
Sources: Hammer product page; Storm, "Inside The Bowling Ball"; Storm, "The Coverstock"; bowling.com coverstock FAQ; USBC Approved Ball List (20 October 2026); USBC Equipment Specifications Manual.