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Muc-Off s Microcell expanding sponge is contoured to an ergonomic shape for maximum comfort and ease of use. Muc-Off also vacuum packed it to take up less space and to use less packaging materials. Don t worry though, once you ve opened the perfectly pink sponge, it expands into an easy to use, bike and wheel friendly size!Bike Friendly SizeExpands After OpeningErgonomic Design