Book strap 1.All products have passed ROHS&SGS 2.easy to fasten and reuse 3.any color is acceptable Product Feature Product name : Functional book strap, Nylon book strap, Nylon velcro straps...Features and usage:1) Made of 100% nylon.2) Self-gripping, infinitely adjustable and reusable.3)Width: 16mm,20mm,25mm,30mm,38mm,50mm,100mm,150mm…, the regular size is 20*300MM 25*540MM 38*650MM…, special ...