Grapplesnake lists Tour M8 as octagonal: eight sides, olive green and two diameters, 1.25 and 1.30 mm. These are the US manufacturer’s specifications checked October 18, 2026.
Its stringing guidance also describes soft edges and a slippery surface that make installation straightforward. Shape and the surface description belong together in the comparison, alongside diameter.
The manufacturer gives qualitative tension guidance: the player’s normal polyester tension. Bring the current model, gauge and reference tension to the stringer when planning a change, then record movement and wear at comparable playing times.
