Product Features:Rubber A Length 61mm, Flat Rubber for Classical Guitar; B-Rubber 57mm Length, Curved Rubber for Acoustic Guitar. Fit less stringed instruments: Ukulele/Bass/Banjo/Mandolin. It is one capo that suits all types of string instruments. Double silicone rubber pads, seamless twisting ensure no sharp spots to damage the Instrument and protect your guitar from wear and scratches. Voltage regulation micrometer, provides greater efficiency at each threshold. Large adjustable knurled tension knob for precise tension control. A clamp with sufficient width allows for precise control to keep the strings in line. Lightweight aerospace-grade zinc alloy body with a super-smooth and solid spring steel finish for long-term use. Specifications:Material: Aluminum alloy, silicone rubberPackage size: 13*13*2cm/ 5.1*5.1*0.8inNote:The instrument shown in the picture is not included. Light shooting and different displays may cause the color of the item in the picture to be a little different from the real thing. The measurement error is +/- 1-3cm. Package Included:1 * Capo Guitar