Surface: Natural cork sheet concealed tack surface. - Middle filler: Superior corrugated board. - Backing: no backing or Natural cork sheet or melamine magnetic steel sheet (able to writing) - Extrusion: wooden frame or Al frame. - Various sizes are available. Customerize sizesa are also welcome ITEM#CYCB-001CYCB -002CYCB -003CYCB -004CYCB -005CYCB -006CYCB -007CYCB -008CYCB -009CYCB -010CYCB -011SIZE(cm)30x4545x6060x9090x12090x15090x180120x120120x150120x180120x210120x240QTY/CTN101051111CTN SIZE (cm) 32x47x2847x62x2862x92x1692x122x392x152x3102x152x3102x182x3102x202x3