<https://www.concordmusic.com/products/perpetual-double-bass-set>
<http://schema.org/description>
"Perpetual Double Bass Strings* ﻿allow extra time for these strings to ship, as they are ordered as needed.\nWhile developed for pizzicato, the Perpetual bass strings will also suit arco players looking for a precise and clear tone with a wide variety of dynamics. A powerful and focused low end gives way to a sophisticated upper register.\n\nextremely flexible rope core steel strings\ntremendous volume and clarity\neasy and comfortable left hand feel-very energetic \nhighly articulate and dynamic response\nchrome windings on all strings\n"
<https://www.concordmusic.com/products/perpetual-double-bass-set>