This is stretchy fishing line made of 100% polyurethane. Unlike Ope-lon rubber, it is less likely to break and is transparent, making it ideal for handmade crafts using general beads, as well as for creating accessories using crystal and highly transparent materials. 《Thickness》0.5mm 《Length》12.5m per piece * Measurement is taken without unwinding the spool. Please allow for slight variations. Some packages may have scratches or stains. Please understand this before purchasing.