The perfect spare ball does exist... Meet Retro RG Spare from Roto Grip.
Not all spare balls are alike. This combination of a 3-Piece symmetric core paired with the High-Impact Pearl Urethane coverstock, finished at 3500-Grit polished, will help you pick up your spares with immense accuracy.
Here's what Roto Grip has to say about Retro RG Spare:
From the start, we knew durability and predictability is what everyone wants
and needs from a spare ball. So, it was a no-brainer for us to use a basic
traditional 3-Piece Core and wrap it with the brand spanking NEW HighImpact™ Pearl Urethane coverstock to ensure that it will do its job time and
time again for many years to come.