O-TORO has six sides; O-TORO SPIN has five at the same 1.23 mm
Toroline lists a hexagonal original and a pentagonal SPIN model. The change in name is accompanied by a different profile.
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Gosen AK Pro CX 17: read the 1.24 mm construction before choosing by category
Tennis Warehouse describes a solid core surrounded by heat-resistant polyamide fibres. Separate material, construction and diameter, then record useful playing time.
Before choosing polyester only for durability
Polyester’s firm, low-powered response can suit fast swings. Players who rarely break strings should compare feel, tension maintenance and replacement demands first.
Separate material from gauge when choosing strings
Choose material and construction, then compare diameter in millimetres. A decision guide for synthetic gut, multifilament, natural gut and polyester.
Broken strings: the backup-racquet clock and a receiver’s first-serve restart
Two USTA cases published on August 27, 2026 describe a 25-second window to borrow a racquet. A receiver’s change after a first-serve fault also affects the restart.