The wooden base is made of solid maple wood. 3mm thick non-slippery EVA improves friction on the floor to prevent the cello from slipping or damaging the floor. 5cm wide nylon strap can be adjusted from 38cm to 69cm to fit most cellists thanks to the sturdy ABS plastic buckle. A 6 cm diameter metal ring attaches to a chair leg on which the cellist is seated. 4 adjustment holes greatly help you choose the most comfortable position for playing, because you Sometimes you no longer need to bend over to adjust the length of the strap to get a comfortable position. The diameter of 4 holes is 2cm, only for cello. (not for double bass) Small size and light weight, good for carrying or storage. All parts of this product use high-strength materials that can withstand prolonged use. Stylish cello shape with beautiful painting and craftsmanship, it matches your perfect cello and makes you stand out from the crowd. crowd than the people who use the common black rubbers on the market.