... environmetal protection material.Specifications:Material: 95% australian woolColor: natural wool color Thickness: 10-25mmSize:diameter, 3-inch (75 mm), ... 5,6,7,8-inch wool wool textile workball (of wool weaving up the hair line), 95% wool content.Can also be customized ... or used with other kinds of fittings,it won't occur static electricity;Super flexiblility,anti-tearing ,compressive,resistance ...