Serving as an entry point into the Unifiber range of high-end masts, Essentials C50 RDM masts strike a good balance between value and quality. Highly recommended for recreational windsurfing, they are the number one choice for beginner and more casual sailors.Pre-preg manufacturing technology and a lower carbon to fiberglass ratio deliver outstanding durability to withstand heavy use. Flexes: We stock Constant Curve - if you would like to order Constant FL Curve or Constant FH Curve let us know The Essentials C50 RDM mast range is introduced in three new specialized curves: Constant Curve — A 'classic' constant curve. Balanced and versatile, with the curve profile that has been preferred by many sailmakers for decades. Constant FL Curve — A modern-day flex top with a little more flexing in the centre. Constant FH Curve — Flexes in the top as much as the Green Curve but is a little stiffer in the centre, resulting in a very fluent curve.