The Tecnifibre X-R1 1.25 tennis string is the most accessible premium range string by Tecnifibre. It features a PHP monocore fiber providing great feel & durability, 1, 125 multifilaments, which increase its power, & PU 400 inside for greater comfort. The string's durability is further increased by the anti-abrasion SPL coating. The X-R1 1.25 is supplied in a 12m (40ft) set, which is enough for one re-stringing. It has a gauge of 1.25mm.