Key Specifications/Special Features: Material: Zinc Alloy Colour: golden, bronze, coffee, silver, black Package: 125pcs/ Box, 53*22.5*24.5cm, 8.8kg Discount: YES if large quantity Flat silicon pad, specially designed for Classic guitars. - Won the National Patent and patent number is 3044016. - Special steel spring with stable physical force, with LIFETIME warranty. - High quality silicon pad, hold the string very tight, no harm to the guitar. - Exellent mechanics structure design, can use it with one hand and switch to other easily. - Suitable for all classic guitar.