Complete set to get started. Your magnetic water bottle holder system with a capacity of 450 ml - your bike needs this. If the bike has a very tight frame where a conventional water bottle won't fit, then the small Twist Bottle 450 is just right. This compact bottle with the magnetic-mechanical holding system fits even in the smallest frames. Whether it's a children's bike or a full-suspension bike - together with the flat magnetic-mechanical holding system, there is no frame that this small water bottle won't fit into. Strong magnets automatically attract various products, center them, and snap them into the base. The mechanical locking keeps the module securely on the frame. This ensures comfortable handling and a firm hold - even under heavy loads. With a simple "twist," the Twist modules can be removed sideways from the holder. This way, even particularly tight and small bike frames can be equipped with a water bottle that no conventional bottle holder can accommodate.