Selkirk Pro S1 Pickleballs

Every outdoor player knows the sound. That dead thunk mid-rally when a ball gives up, followed by the ritual squeeze-test and the toss toward the fence. Selkirk looked at that ritual and decided to attack it with a warranty: crack a Pro S1 within a year and they’ll replace it. That’s either supreme confidence or a marketing stunt, and after enough court time with these, we’re leaning confidence.

Build & Quality

The Pro S1 breaks from the pack in two ways. First, it has 38 holes instead of the usual 40 — a patented pattern Selkirk developed with aerodynamic testing at Washington State University, claiming more lift and less drag. Second, it’s made with seamless rotomolded construction, so there’s no weld line and no soft spots. Squeeze one anywhere and it pushes back the same.

That seamless build is the whole story on durability. Balls with molded seams crack at the seam; the Pro S1 doesn’t have one. In our experience it shrugs off the conditions that murder X-40s — cold mornings, gritty concrete, bangers who treat every third shot like a speed-up. The failure mode changes instead: rather than cracking, a Pro S1 will eventually go slightly out of round. It’s a slower, less dramatic death, and the warranty doesn’t cover it, which feels like a lawyer wrote that part.

The ball comes in at 0.93 oz and 2.8 inches — a hair heavier and smaller than an X-40 — and it’s USA Pickleball approved, so you can bring it to sanctioned play. The neon color is bright but not quite the retina-searing optic yellow you may be used to. Against certain court colors at dusk, we lost it a beat sooner than we’d like.

Performance

The extra weight and tighter hole pattern make the Pro S1 quick. It comes off the paddle faster than an X-40, with a firmer, crisper feel — closer to a Dura Fast 40’s pace without the Dura’s legendary fragility. If your group has only ever played Franklins, expect a session of adjustment while everyone’s counters sail long. After that, most players don’t want to go back.

Where the ball genuinely earns its hype is wind. The 38-hole pattern isn’t a gimmick; the Pro S1 holds its line through gusts that send other balls wobbling like a knuckleball. On a breezy day, drops and lobs stay playable instead of turning into coin flips. Bounce is consistent and slightly lower than the X-40, which rewards players who like to keep the ball down and grind out dink battles.

Spin response is strong thanks to the firm surface — heavy topspin drives kick forward off the court the way advanced players want. The caveat is that all of this assumes outdoor hard courts. Indoors, the Pro S1 skids and plays unpredictably. It’s an outdoor ball; keep it there.

At $14.99 for a 4-pack you’re paying more per ball than for X-40s, but that math flips fast once you count corpses. One Pro S1 routinely outlives several cracked Franklins. For the players who go through balls the fastest — cold-weather diehards, drilling partners, full-time bangers — it’s cheaper by spring.