BAZHOU Premium Material: The seam guide ruler is made of transparent acrylic, which could clearly see the opening and various angles. The sewing guide is made of metal and magnet, sturdy and reliable. The ruler could also measures small pieces for home decor projects. Magnetic Seam Guide: It is a good helper for sewing work. Ensure sewing positioning, use strong magnetic force to prevent sewing displacement and movement. It did not require any tools or screws, and easy to be installed and removed at any time. Delivery Quantity: 1pc, Package Contents: Only the above package contents, excluding other products. Size: 13.9x6.3cm (Reminder: The size is measured manually, please allow 1-2 cm measurement error) Color: transparent (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)