Ashaway Supernick XL is 1.25mm in diameter for superior resilience and feel of the ball. Multifilament nylon core and textured surface increases ball control and spin characteristics. Ashaway Supernick XL original is the best selling squash string in the world. Powerful and durable with a fantastic feel - It is used at the very highest level of the game. Nylon multifilament core and unique braided surface offers all players superb feel and durability.