The Shadow SH RB-PRO is a stereo pickup and preamp combination for upright bass. It was developed in collaboration with the well-known Rockabilly bassist Didi Beck. The SH RB-PRO was designed specifically with Rockabilly in mind, but it can be used for any musical style. The system is designed to use two included pickups, one for slap (mounted underneath the fingerboard) and one for the bridge.