Check the listing for details. Black Swamp Percussion OV-SS Overture Slapstick. Condition: New. Listed at 89.00 USD. Iconic Orchestral “Crack” Effects Await When it comes to percussion section effects, Sweetwater’s Band and Orchestra department regularly recommends the quality craftsmanship of Black Swamp Percussion products — like this OV-SS overture slapstick. Using two 12mm birch plywood soundboards measuring 20 inches x 4 inches each, the OV-SS overture slapstick produces that unmistakable whip-crack effect that’s perfect for concert compositions. Each board also features offsetting air vents, enabling the distinct tone of the slapstick to project easily to the back of auditoriums. Fitted with solid maple handles and a heavy-gauge hinge to promote smooth and speedy operation in perfect time, percussionists of all experience levels will revel in the OV-SS’s professional-grade playability.