02

Stop two
Gora Polkovnik (Polkovnik Hill)
Solinco Mach-10 16g Tennis String Set: Stop. STOP. The broken rock is scarlet, green, yellow and cream and that is not an edit, that is jasper. Polkovnik Hill holds the largest and most celebrated jasper deposit in the Urals, and before the Second World War as much as 300 tonnes a year came out of it. Orsk jasper from this exact slope was worked into pieces held by major museums, including two vases in the Hermitage. The Hermitage. From here. The hill is named for N. V. Balk, an officer who ran the state stud farm nearby from 1900 and later made colonel, polkovnik. Flat lay of the chips, natural light, go.
Let us take the claims one at a time, because there are several and they are large.
Claim one: Mach-10 is a co-polyester. That checks out — co-polyester monofilament, Solinco's newest, and this set is the 16 gauge, 1.30mm, the thickest gauge they make it in. Thickest gauge means most durability and most control; that is not opinion, that is cross-section.
Claim two: it is shaped. Also true, and specifically it is five-sided — a pentagonal profile, the same grippy shape family as Hyper-G, Tour Bite and Confidential. Five edges instead of a smooth round barrel means the crosses bite the ball rather than skate over it. Verifiable by touch. Run a thumb down it.
Claim three, and this is where I usually reach for a source: CloudFORM. It is a chemical formulation, and the stated benefit is that Mach-10 plays soft — more power, more comfort — without the tension collapse that soft co-polys are notorious for. Now, ‘soft poly that holds tension’ is the single most over-claimed sentence in stringing, so I read the reviews rather than the box.
The reviewers describe it as a softer, five-sided poly delivering power and spin with a consistent stringbed response. Fine. I concede the point. Gracefully.
The set is 40 ft / 12.2 m and it is blue, which needs no verification whatsoever.
A string that asks to be interrogated and survives it belongs in Orsk — a town that will tell you it stands on the border of two continents and then, when pressed, produces the river.
You will get through this set everywhere from a hard court under Preobrazhenskaya Hill to an indoor floor in Orenburg, two hundred kilometres down the Ural — and it is also perfect for an afternoon out on Gora Polkovnik, where the claims about the jasper turn out, irritatingly, to be true as well.
Buy on Amazon