25 yard spool. Also available in 100 meter and 1,000 meter spools. Use Kreinik Reflective Yarn as a carry-along fiber with other yarn specs: It is made of 22% polyester, 53% glass beads, 12% phenolic resin and 13% adhesive. Can be dry cleaned and washed (40 C/104 F). Do not use bleach. Iron on low. Not dye resistant. Not to be relied upon as your sole nighttime safety garment; use it along with other safety rated reflective material.