... 2.colors available:clear,black,white,etc. 3.environmental 4.for book binding 5.fast shipment 25mm office plastic binding ... blue red green gray and transparent, other requests available4.Design : round and oval5.Features : 1) mainly used in binding notebook document ... : non-corrosive , non-toxic 3)rigid waterproof and high resisting 4)we are professional manufacturer , offer the best quality and service ...