The main difference is the coverstock. They all have their own unique one. The Nexus f(P) and the Nexxxus f(P+S) are both polished pearl coverstock balls with the same arrowhead core. The Nexxxus f(P+S) is a little stronger than the Nexus f(P) but they are very similar balls. The Nexus f(P+F) and the Nexxus f(P+R) are both sanded solid coverstock balls with the same Rotor core and they are both stronger than the Nexxxus f(P+S). The Nexxus f(P+R) is a little stronger than the Nexus f(P+F). All of these balls are designed for heavier oil.
I personally hate the way that a lot of companies are naming so many balls the same thing. This is probably the worst and is extremely confusing. A lot of the companies do it it now though. There's the Hammer Vibe series, the Hammer Taboo series, the Ebonite Mission series, the DV8 Hell Raiser series, the Columbia300 Encounter series and plenty more. I understand when the name it by what it is like by adding solid or pearl after it like the Columbia300 Freeze Line of balls but when they name it by the color or what seems like randomly it just makes it confusing.
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