Peter Infeld Bass Strings 3/4 DCentered tonal core, strong in the mid frequencies Easy to bow, plenty of growl and sustain Substantial sound colors that are easy to control Extremely reliable PETER INFELD strings for double bass make you shine in many different ways. The strings are very reliable and have a remarkably powerful sound in the mids, with a centered tonal core. They boast a substantial amount of sound colors that remain controllable for you as a player at all times.