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.

MACE Core
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.

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