The mast you buy is the engine room of your windsurf rig. If you mismatch the mast curve you seriously effect the performance of the sail. That’s why we at Severneshop.com ONLY stock Severne masts. The bend curve is in the centre of the mast and stiff at the top and bottom – this is unlike constant curve masts or flexi-top masts. Put the wrong mast into your sail… well it’s like putting petrol in a diesel car!! Whether it’s the Gorilla Range with 2 years Guarantee up to the 100 range with razor sharp ‘whip reflex’, you know your sail will perform better on the mast it was designed to function with.