Part Number
Core Type
Propel Pearl
Finishing Steps
4,000 Micro Pad
12 - 16 Pounds
Asymmetrical Diff.
RG Max
RG Min
RG Differential
RG Average
Center Heavy (1)
2.8 Cover Heavy (10)
Hook Potential
Low (10)
160 High (250)
Early (25)
110 Long (235)
Breakpoint Shape
Smooth Arc (10)
90 Angular (150)

Evil Siege

Propel Pearl Coverstock

Propel Pearl is an evolutionary coverstock developed by Brunswick to improve the mid-lane and backend traction of the ball on today’s slicker oils and lane surfaces. The Propel Pearl coverstock was discovered through testing of new formulation additives and process changes in coverstock manufacturing.


Mechanical Asymmetric Core Engineering. The MACE core has three major benefits: ultra-low RG core system to engage the Propel Pearl coverstock, high RG differential to aid in traction through heavy oil and high RG asymmetric differential to quicken the response time to friction. Designed as a two-component elliptical core system, the MACE core is dynamically the strongest asymmetric core ever produced for a Brunswick ball.

Ball Motion

The Evil Siege unites the Propel Pearl coverstock and the proven MACE core to produce a ball motion that is strong in the mid-land and aggressive on the backend. The Evil Siege is the ball when your game needs help battling medium to oily conditions and poor pin action.

Reaction Setup

The Evil Siege can be drilled using the standard drilling techniques developed for asymmetric bowling balls.

Lightweight Engineering

The unique core shape of each Brunswick ball is used for weights from 14 to 16 pounds. This approach to lightweight ball engineering provides bowlers with consistent ball reaction characteristics across the weight range. The same drilling instructions can be used for 12- and 13-pound balls. This is because Brunswick uses a generic core shape with an RG difference that is close enough to the 14-16 pound shape.

Reaction Characteristics

  • Out of the Box: With its 4000-grit micro pad finish, the Evil Siege will provide excellent mid-lane recovery and a strong continuous backend reaction that matches up on medium to oily lane conditions for a wide range of bowling styles.
  • If your Evil Siege goes too long: A smooth surface will sometimes cause the ball to go too long before breaking. To get your Siege rolling sooner, dull the surface with a 500-grit micro pad to increase hooking action. To further increase hooking action, use a rougher abrasive to create an earlier reaction.
  • If your Evil Siege hooks too early: Smooth your Evil Siege with 2000-grit micro pad to increase length. If more length is needed, smooth the surface to 4000-grit micro pad. If more length is still desired use Brunswick’s Factory Finish High Gloss Polish to increase length to the maximum.
Buy This Ball Pro Tips

“In practice sessions, don’t just automatically hit the reset button if wood is left standing; roll your conversion shot.”

— Parker Bohn III

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Evil Siege