This item is a violin part, made of metal material, it is durable and use. it has the good workmanship details, you will use it for a long time.it is not easy to wear, and fall off. you can install it easily. good Violin Part for you.Provides a smooth and stable playing experience. Features -Color:As Shown-Material:Metal-Size:6.10X0.80X0.80cm/2.40X0.31X0.31in-Note: Suitable for 4/4 and 3/4 size violin bows.- It can be well applied to your daily practice and performance, very practical and convenient.- The surface of the violin bow frog screw is polished and smooth, and resistant to wear.- This violin bow frog screws are exquisite in craftsmanship,hard and smooth for durable usage.-You can install it without worries.Practical accessory for violin lovers, and also a good choice for your gift.- This violin bow screw is easy to use, with sturdy metal material, this violin bow frog screw is sturdy for long time use.Packing list: 2 x screws