Functions: the clarinet thumb cushion can eliminate sore thumbs and provide extra thumb rest, protecting your instrument and hands, alleviating the fatigue of long-term playingHigh flexibility: the clarinet thumb protector is made rubber material, which is tear-resistant and durable, ensuring high flexibility, comfortable wearing feelingUniversal finger rest size (approx.): 17 mm/ 0.67 inch in length, 15 mm/ 0.6 inch in width, 10 mm/ 0.4 inch in thicknessPackage detail: comes with 12 pack black thumb rests, helping to maintain the correct finger position, suit for most clarinetsSpecial shape design: the shape of this clarinet soft thumb rest is designed particularly to fit your instrument greatly