Made of 6082 T6 aluminum series in accordance with the Optimist class rules; It's a lightweight durable performance spare set. This set consist a halyard system with - Dyneema halyard line - Optinew hook-in block and special design halyard block - Optinew wind indicator - Single hand sprit handler - All needed pins and mast sleeve including Its hard anodized. It offers an advanced level of performance with low frictionstrong non-wearing delrin plug and spare parts.