Engelhardt ES-1 - The Swingmaster is the top of the line from Engelhardt. Used by professional players everywhere this bass continues in the rich heritage of upright basses made in the original Kay factory. This string bass possesses a remarkably rich and vibrant tone through the entire range. Beautiful rubbed and buffed Cremona brown finish. Top of close grained spruce, back of curly maple. Deluxe ebony fittings. Violin shaped. Superbly crafted. Ebony fingerboard, reworked in our own shop for proper relief.