Adjustable metal bridge with springs. - Model Name: BADASS BASS II - Manufacturer: Leo Quan Inc. - Material: Metal - Function: Adjustable bridge - Number of mounting holes: 5 - Color: Originally black - Features: Spring-loaded bridge - Recommended installation: By a professional guitar repairman Originally attached to an Atelier Z Club4 from the 1990s to the 2000s. The base of the bridge was also black, but it has worn off to silver, but there is no problem with use. The set screws are not seized. The saddle grooves were probably cut at the Atelier workshop at the time. Mounting screws included. No claims, no returns. Thank you for looking.