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Flex spring wall gives a perfect fit in any tenor saxophone. No more loose-fitting end plug or sax cap! Extend it to safely hold the sax in a loose fitting case and protect the octave key. Flex wall absorbs shock impact that can bend saxophone keys or body tube. Vented at top and side for more air flow to dry the sax and leather pads after you play. Replaces traditional saxophone end plugs or sax caps that trap moisture inside the sax.