... -feel,and wool with diameter more than 15D is coarse fiber with good elasticity (e.g. Wool with7D and 15 D ... factory and toy factory ).b.28mm and 32mm are short-fiber(e.g.7D×32),suitable for machine filling;51mm and ... 64mm are long-fiber (e.g.15×64)with good elasticity.They can be ... hgih-grade products,e.g.sofa,pillow,etc polyester hollow staple fiber