Core Conservatory model 42 advancing-level bass. Fully carved spruce top, maple back and sides, Bass aged. Includes endpin and maple bridge with height-adjusting wheels. Adjusted with D'Addario Helicore strings. The Core Conservatory instruments help musicians take their playing to the next FULLY level. Practicing, lessons, and rehearsals require a student's commitment, and these instruments CARVED reward the extra efforts with greater range of tone and dynamics. The luthiers spend more time in carving and shaping the plates for improved acoustic response. These and other subtle details signify better overall workmanship which make a big difference and help the players' musical education flourish. 3/4, 1/2 & 1/4 sizes available