12.5O long lambswool with 19.5O total length; Fits most threaded standard and extension handles, specifically Libman #611, #612, and #613; Made with real lambswool, to naturally attract and hold the smallest particles; Retains dust until spun free or washed out The Lambswool Duster is made from real lambswool and can pick up the finest of particles. This Duster is great in all housekeeping applications.