Flowform Collection Ff21. Monoblok Long a market leader in forged wheels, HRE gives its FlowForm ® line of wheels with iconic styling and a level of quality embodied by the HRE brand, all at an accessible price point. This cast flow-formed wheel is crafted with the highest level of design and engineering available in the world today. Finishes Shown: Liquid Metal and Tarmac *By request/order. *Price per piece.