This Mapac A4 Premier Maxi black portfolio has a leather grain water resistant finish and a 'staylock' binding sysytem. 'Staylock' is revolutionary new, easy to use ring mechanism that guarantees no loss of sleeves or broken rings. It also enables you to choose your ring format and is fully adjustable at any time.The spine of this portfolio incorporates a solid steel bar. A 70mm gusset gives extra capacity. This portfolio has a useful storage pocket inside front cover. The Premier Maxi portfolio has ring binder mechanism for portfolio sleeves.