Product Description Spacer kit in different widths for converting a normal hub with derailleur freehub body to singlespeed. Technical Information:Material:aluminiumOther:to be used to convert freehub bodies for singlespeed useManufacturer Number:FW9999 Contents:1 x Surly lockring6 x Surly spacers Manufacturer: Surly 6400 W 105th St Bloomington MN 55438 USA derby@surlybikes.com Distributor: Cosmic Sports GmbH Leyher Straße 47 90763 Fürth Germany info@cosmicsports.de