QA1 Pro Coil System High Travel Coil-Over Spring - 3.8 in Upper ID - 2.5 in Lower ID - 9 in Length - 450 lb 2858FB it is a closed cell

it is a closed cell construction

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QA1 Pro Coil System High Travel Coil-Over Spring - 3.8 in Upper ID - 2.5 in Lower ID - 9 in Length - 450 lb 2858FB it is a closed cellAvailable in 7", 9", 10", 12", 14" and 16" lengths, QA1 offers an assortment of high travel springs with a silver powder coated finish. Made in the USA, these 2" I. D. high travel springs are manufactured from specially designed high tensile, chrome silicon alloy spring wire, which allows them to have fewer coils and a smaller wire diameter. As a result, these springs are lighter and have increased travel due to the larger distance between the coils.