Description Features: Made of High quality brass material, which is durable to use, ensures a long for time service. The surface is of plating treatment, not easy to oxidize and can be used for a long for time. Professional and practical design with beautiful appearance,add a elegance to your guitar. Easy to install and convenient to use. Great replacement for your old, broken ferrules. Specifications: Material: Brass Height: Approx. 9.2mm/0.36inch Diameter: Approx. 9mm/0.35inch Top Hole diameter: 5.0mm/0.20inch Small Hole diameter: 2.5mm/0.10inch Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 6 x Brass String Ferruless