Optiparts Optimax MK4 mast Optimist The most stiff and powerfull mast, designed for experienced, heavier weight sailors. The MK4 mast for the Optimist is mainly suitable for sailors above 45 kg. All our spars are made of the best materials, the masts are made of superior Lanurep spacecraft alloy, ensuring maximum stiffness/weight ratio. Every batch of tubes is tested to ensure constant quality and bent characteristics. All masts are hard anodized to a dark grey color, providing a very durable and long lasting surface. These spars are equipped with the best parts you can find on the market: Harken blocks, Windesign parts, and Optimax accessories. Features: Superior Lanurep spacecraft alloy High grade 45 um hard anodized surface Windesign wind indicator PRO Pennant holders Harken hook-in block 3 mm Dyneema primary halyard line with Windesign low friction ring Technora / Dyneema secondary halyard line Hard anodized aluminium Clamcleat Aluminium pin stop Sprit adjuster handle Low friction end stop