Mari's knitting machine weights. Set of 5 plastic 2 sewing clips with 1oz lead-free weights covered in fabric. Clip onto yarn ends when starting a project and when changing colors.Clip onto edge of project to keep weighted down without damaging the knitting. Works with all machine brands. When machine is properly secured, weighting down the project as it emerges from the knitting machine helps prevent the yarn from pushing up and dropping stitches. Fabric designs vary but are color coordinated. Hand crafted in usa with recycled materials. This item is made of plastic.