Size and Material: Outer ring diameter: 133mm, made of Silicone material, small size and easy to storage. Product Feature: With simple and practical design, the bobbin ring holders can organize the bobbins well to the unraveling or tangling of thread on bobbin, really save your space Application: The sewing Bobbin Holder is suitable for most of metal or plastic sewing machine bobbins Nice Gift: With a small and simple design, cute colors and shapes, this bobbin ring holder is a good gift for mothers, relatives, and sewing lovers. It can help them organize the bobbins and maintain a clean tidy environment. Package Include: 2 Pack Rubber Bobbin Holder ( Blue and Pink )