snap frame 1.aluminum front loading 2.standard size: A0,A1,A2,A3,A4 3.Mitred or round corner. 4. easy to change graphic; 2012 fashion Varies style aluminium snap frame Snap Frame's spring clips snap open on all four sides for swift and easy graphic changes:spring clips snap open on four sideseasy to change graphiclow price, high quality,good service,fast deliveryother size can be availablepacking ...