 In contrast to piano and pipe organ keys, Hammond keys have a flat-front profile, commonly referred to as "waterfall" style.Early Hammond console models had sharp edges, but starting with the B-2, these were rounded, as they were cheaper to manufacture.The M series of spinets also had waterfall keys (which has subsequently made them ideal for spares on B-3s and C-3s), but later spinet models had "diving board" style keys which resembled those found on a church organ.