It keeps your yarn from rolling away when you are knitting with it. Made with durable material to stand up to rigorous knitting. It has a channel cut in it for easy yarn loading. Check out our website for color descriptions. https://www.philaminar.com/posts/colors/ Check our our Instagram for recent photos. https://www.instagram.com/philaminarprint/ Dimensions: 154.8 x 154.9 x 92.4 mm (6.1 x 6.1 x 3.7 in) 154.8 x 154.9 x 130 mm (6.1 x 6.1 x 5.1 in) with removable lid Process and Materials: These holey bowls are 3D printed! They're formed by heating polylactic acid (PLA), an eco-friendly, biodegradable polyester thermoplastic, and extruding it through a nozzle layer upon layer in repeatable patterns. Although this process is fairly precise, it’s not perfect–– environment, material, and processing conditions can cause small variations from piece to piece. As such, each one is unique! After printing, rough surfaces are trimmed and sanded to provide a snag-free environment for your yarn. They're then heated again for further smoothing.