Tein Flex Z CoiloversThe Tein Flex Z coilovers are a high end, top quality, ride height adjustable shock absorber at an amazingly low price. By using a "sealed structure" assembly method the Flex Z coilovers are able to offer all the features of higher priced products with Tein's famous reliability without going over the budget. With the sealed structure the top end of the shell pipe is narrowed, oil and gas are injected, and the whole is sealed by crimping the metal.