Text Size

AMF uses a numeric rating system designed to differentiate our coverstock strengths. F10 least aggressive - F90 most aggressive. Note: Core dynamics must be taken into account with shell strength when selecting equipment.


The Heat Stroke has a polished F55 Pearl coverstock and medium flaring core designed to allow bowlers to see a longer and more controllable reaction on drier lanes while still maintaining a strong drive to the pit.  

Attributes    Tech Specs
Coverstock F55 Pearl    Weight        R.G.     Diff 
Color Fire & Brimstone          16 LB  2.48   0.033  
Finish Polished 15 LB  2.49    0.033 
Core Type Symmetric 14 LB  2.51    0.033 
Sku# 1872-48-XX 13 LB  2.53   0.033 
Available Wts           12-16 LB. 12 LB 2.61    0.022 
    Drill Sheet Magic-8   Flip Magic-8