[2 sizes fit for guitars] these black rubber guitar sound hole covers have 2 different sizes, and the guitar acupuncture cover of the diameter 10 cm is suitable for use in 40/41 inch guitar; the diameter length 8.6 cm guitar sound hole cover is suitable for 38/39 inch guitar.[High quality] These black guitar sound hole covers are made of high-quality rubber, strong and reliable, smooth, not easy to break, can serve you for a long time, effectively prevent whistling while also helping you keep exquisite guitar clean neat.[Easy to install and use] Guitar sound hole covers are very easy to install and disassemble, just put it on the sound holes, easy to assemble, not easy to fall off, convenient, save time, is your daily use and stage play guitar.[Practical features] Guitar sound hole cover is designed to cover the sound holes on the guitar to reduce unnecessary echoes or feedback, and avoid dust such as dust into the guitar without affecting guitar enthusiasts or guitarists.[Intimate and practical gift] You can bring the sound guitar hole cover as a gift to your family, friends, colleagues and others like playing guitar. It will indicate that you care about them, share these guitar holes, and your relationship will be promoted.colour: blackMaterial: rubberPackage Contents:3 x 38/39 inch sound hole covers3 x 41/42inch sound hole coversOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.