... more Material: 3 layer cardboard forming, 930g/m² corrugated fibreboard with E flute,white board printed both. Or 630g/m² cardboard ... days for white board sample, 5—7days for color sample with graphy covered, 15—20 days for mass order printing ... paper back side usually. White board backside or colorful printing with double side also could be protected.Surface Treatment: UV varnishing protected ...