This is a Korean-made Bigsby B5 type tremolo unit. I purchased it because it is said to be less prone to going out of tune than the Chinese-made ones, but it is a new, unopened item. Please refer to the details below. Color: Silver Brand Name: Yibuy Material: Zinc Alloy Size: 224.5 x 98.5 mm / 8.84 x 3.89 inch (Length x Width) Weight: 431g Package Includes: 1x Guitar Vibrato Bridge 1x Spring 4x Screws 1x Spacer #Bigsby #TremoloUnit #Tailpiece