The Blackgold rigging constitutes the top, worldwide for the Optimist. It has been chosen as stakeholder and logically complies I.O.D.A..The anodized mast 45mm in diameter is the optimal base. The Blackgold rigging constitutes the top, worldwide for the Optimist. It was chosen as an official and logically compliant I.O.D.A ..- Livarde Blackgold Ex960: Diam. 27mm. Specially recommended for barriers of less than 45 kg. Please contact us for a transport costs quote. Ex900 Blackgold Mast. With Rigging Pack.ex932 Blacklite 32mm Boom Completeex940 Blackgold Medium 40mm Boom Completeex945 Blackgold Power 45mm Boom CompleteEx955 Blackmax 55mm Boom CompleteEx960 Blackgold Sprit. Ex970 Blacklite Set (ex900, ex932, ex960, ex13591) ex975 Blackgold Medium Set (ex900, ex940, ex960, ex13591) ex978 Blackgold Power Set (Ex900, ex945, ex960, ex13591) ex980 Blackmax set 60, ex13591) Ex13591 Rigging Pack as With All Blackgold Sets- Optimist Optimist Blackgold Medium 27mm Sprit Optiparts DESCRIPTION We offered a choice of Two Optimist Sprits: 26.6 mm Blackgold Lite Optimist Sprit (ex959) 27 mm Blackgold Medium Optimist Sprit (ex960) The 27 mm Blackgold Medium Sprit is followed for the Majority of the Sailors and Made of Black Anodized 7075 Tube and Fitted with Black End Fittings and Sprit Chafe Guard. This Sprit is 20% Stiff Than the 26.6 mm Blackgold Lite Sprit.