1、Notch Design: This sewing machine bobbin has a notch to wind the loop yarn for stable winding, allowing you to use it more efficiently. 2、No Yellowing: Our sewing machine bobbin is not prone to yellowing and breaking, and can be used safely under normal operation. 3、Transparent Appearance: The sewing machine bobbin has a transparent appearance, which is very fashionable and easy to use and keeps you in a beautiful mood when you use it. 4、Applicable Model: Our sewing machine bobbin is suitable for XA3811 151, bobbin SA155, if you happen to have related needs, this one is suitable for you. 5、ABS Material: The sewing machine bobbin is made of ABS plastic material with excellent craftsmanship, so you can use it with confidence. 10 x Sewing Machine Bobbins Item Type: Sewing Machine BobbinMaterial: ABSColor: TransparentPacking: 10pcs in a bagWeight: Approx. 15.6g / 0.55ozHeight: Approx. 11.5mm / 0.45inDiameter: Approx. 20mm / 0.79inApplicable Models: Suitable for XA3811 151, H Approx. 9.2mm / 0.36in and bobbin SA 155.