Description: 【Engraved Sizes and Interchangeable Pins】: The knitting pins come in various sizes, clearly engraved on the surface for easy differentiation. The circular knitting pin cables feature an interchangeable design, allowing you to easily change pins for convenient sewing and knitting. 【Material and Smooth Surface】: This interchangeable crochet pin set is made from wood and aluminum, offering rust resistance, a smooth surface, and no rough edges for long term use. 【Easy to Use】: The cable moves with the stitch pattern and can be easily connected to the tip for hook knitting; the pin tips are lightweight so even after hours of knitting. It's great for friends and family who love to knit. 【Material & Size】: Made of Aluminum Wood with PU case with storage case dimensions of 20*18*3cm. 【Package Includes】: 13 pairs of aluminum pins + 4 round threads + 4 position buttons + 1 tool patch, 1 mini wrench + 1 extension connection tool + 1 PU bag. Size Chart: 20cmx18cmx3cm/7.87inchx7.09inchx1.18inch Package Includes: 1 Set of Interchangeable Circular Knitting Pins Note: Please allow slightly errors 1-2cm differences due to manual measurement.