... constructure types for rowing1. Honeycomb A+ type: external/internal skin use carbon fibre,carbon tapes reinforcement, honeycomb ... ,honeycomb core material.3. Honeycomb B type: external/internal skin use kevlar, carbon taples reinforcement, honeycomb core ... reinforcement, lantor coremat core material5. Fibreglass A type: external/internal skin use fibreglass, carbon tapes reinforcement, lantor coremat ...