Deda elementi superzero 25mm setback seat postthis stunning seatpost is engineered for fast paced road use as it gives you outstanding comfort and support as you clock up the miles on your road bike. It features an awesome unidirectional carbon construction which allows it to produce a competitive strength to weight ratio. This means you'll benefit from its exceptional durability on longer journeys while its low weight profile shaves off valuable weight from your road bike. Features material unidirectional carbonuse roadsetback 25mmlength 350mmrail compatibility Ø7x9.5mm oval shaped railsdi2 compatibility compatibile with deda adaptor for di2 internal batterypart number dpa316w 31.6mm versionweight 215g approxbuy deda components from chain reaction cycles, the world's largest online bike store.