The shimano 105 5600 10 speed double chainset is made with aluminium crank arms in order to minimise flex and keep the weight down using a system that allows for easier installation adjustment and maintenance the innovative shimano 105 chainset is yet another member of the flawless shimano bike parts range shimano 105 5600 10 speed double chainset features lightweight hollowtech ii 105 10 speed double chainset innovative hollowtech forged and anodised aluminium crank arms util