These masts are all about value and durability. The epoxy composite construction will stand up to the abuse of school use and offers the first timer a super durable affordable mast. 100% Epoxy Construction Two piece mast RDM/Reduced diameter SizeDiameterCarbonWeight 270 RDM 0% 2.55lbs 280 RDM 0% 2.8lbs 300 RDM 0% 3.35lbs 310 RDM 0% 3.4lbs 340 RDM 0% 4lbs 370 RDM 0% 4.25lbs 400 RDM 0% 4.8lbs 430 RDM 0% 4.9lbs