SWK CARBON MAST Y30The SWK Carbon 1. 5 13 85 Y30 is designed for riders who demand maximum control and speed at the highest performance level. Compared to the SWK Carbon Mast 1. 8 13 85, its profile is 3 mm thinner, reducing drag and enhancing responsiveness, the perfect setup when riding smaller front wings or aiming for top end speed. Built with the same 100% M40 Hi Modulus carbon construction as the SWK Carbon series, it uses an optimized layup of unidirectional (UD)