Tune TWB 4 (02/28),TWB-4 Standard-TUNE Official Web Site,TUNE Official Web Site,From the Custom order> The 'Beta6 CUSTOM' with quilted maple top, ebony fingerboard, ATELIER Z pickups, and Bartolini XTCT preamp. It delivers a delightful slap sound and smooth two-finger playability. Thank you,BARTOLINI XTCT with MCT375