The Yamaha CL-945B tom arm features a ball and socket design, which allows superior adjustment of your drum's position. Designed to fit Yamaha's YESS (Yamaha Enhanced Sustain System) mounting system. Since the YESS drum mounting hardware uses a rod clamp system that doesn't require putting a hole in your drum shell, it doesn't influence your tonal output. That means that if you're using YESS clamps on your toms, adding the flexibility of the CL945B doesn't mean compromising your sound.