Hammerax Boomywang Hybrid Gong-Style FX Instrument 18 In Extra-Thin Create wobbling, wah-wah effects by hitting dead center quickly. Hit with sticks, mallets, or hands. Great for drummers - the wobbling sound works in many settings. The Boomywang frame mounts on any boom or arm similar to a chime. Made from a super alloy of startling flexibility.