The Astrolene yarn used in this dust mop is a blend of 4 synthetic fibres. Tightly twisted and heat-set, it resists fraying, does not produce lint, and stands up in the wash. Drying time is half that of a standard cotton dust mop. Universal tie-on style of boot fits both 5" collapsible or rigid frames. Treated with Velva Sheen Dust Control treatment to aid in picking up fine dust and particles.