Snopake Superline Ring Binder Polypropylene 2 O-Ring 25mm Size A4 Clear Ref 10183 [Pack 10] Polypropylene ring binders weigh less and last longer than traditional designs. Two O-ring binding mechanism with 25mm ring size. Features include a full-length wrap-around index holder on the spine, a pocket for loose papers inside the front cover and a business card holder. Transparent Superline colours. Colour Clear. Packed 10.