The SuperNick XL family of squash strings features a multifilament nylon core encapsulated with a high tenacity monofilament nylon wear surface Download a SuperNick XL Micro & SuperNick XL Catalogue Page POWER: FEEL: TENSION STABILITY: DURABILITY: POWER: FEEL: TENSION STABILITY: DURABILITY: FEATURES ADVANTAGES SPECIFICATIONS Material Nylon Multifilament Gauge Micro: 18 (1.15 mm) XL: 17 (1.25 mm) Length  30 ft (9 m) set / 360 ft (110 m)   reel Colors Micro: Optic Yellow with Red / Blue Crosses   XL: White with Red / Blue Crosses  Multifilament construction for gut-like performance Textured Surface increases the ability to impart spin and cut the ball Micro: Thin gauge for optimum ball control and spin characteristics XL: Soft feel for excellent playability and resilience Usage: Top professional and amateur players Players looking for improved feel and control of the ball Stringing tension: Micro: Up to 40 lbs (18 kgs) XL: Up to 42 lbs (19 kgs)