I use a plastic. As Aymers said, why have multiple deliveries? I shoot the spare ball the same way as my strike, just s lot more left. When I try with a regular ball, it just feels so uncomfortable on everything. Then the damn ball hooks most of time right before it gets the pin. Spare balls are cheap, fits in my 4 ball roller, no sacrificing any balls, so spare ball is way to go for me.
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