mainly made of hard plastic , and perfect for creating your own bias tapes in minutes. The item is a set of 4pcs portable and practical fabric bias tape makers in different sizes and different colors It is easy to use, fast, accurate, economical and automatic. It is an accurate tool that automatically folds into a perfect half. Make any fabric into an accent, border or trim. It's fast, economical and perfectly coordinated. Pull the fabric through and iron--folds it perfectly, ready for sewing on or gluing.