UNIFIBER HD SDM ALUMINIUM MAST EXTENSION (U-PIN)For light weight, stiffness and impact resistance try these aluminium reinforced weapons. Super stiff with additional aluminium reinforcement between the plastic base and shaft to provide peace of mind in even the gnarliest conditions. PROS Heavy Duty use Solid and compact for barefoot friendly rigging Solid HD plastic base 8: 1 downhaul ratio CONS When derigging, care needed to ensure the collar hinge does not catch on the luff sleeve