- neck support rest for stringed instruments, patented innovative functional design, 2 different heights and various angles (5" for acoustic instruments, 3.5" for electric guitars and basses), fits acoustic and electric guitars and basses, ukuleles, violins, banjos, mandolins and more, full support for the fretboard and/or the back of the neck, safe use on all finishes, made of sturdy, secure soft gel material, transfers the vibrations from the neck to the Cradle Cube, so clip-on tuners can be attached directly to the Cradle Cube, innovative lids can hold the strings during fretboard work, open bottom can be used to store tools