Precision blended cross-linked polyurethane system
High density and maximum resiliency
Ultra-thin ZN composite cover to get to the core faster
Seams: Flat
If your game is slow pitch softball, then your ball is the USSSA Thunder ZN Polycore Softball. Deliver your best game with the best ball in softball construction.
![](http://www.unitedsupplycorp.com/modules/search/fancy_modal_img.php?screen_sku=4U540Y&screen_title=12" Usssa Thunder Zn Classic M Stamp Slowpitch Softball - 12 Pack&screen_single_image_enlarged=//unitedsupplycorp.com/images/Dudley/650/4U-540Y_ThunderZN.jpg&screen_single_image=//unitedsupplycorp.com/images/Dudley/650/4U-540Y_ThunderZN.jpg)
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