A3 White Card Stock Paper Size 11".7 X 16.5 (297 X 420 Mm) - Heavyweight 100lb Cover (270gsm) - 50 Pk A3 - 11.7 x 16.5 in (297 x 420 mm) - Ledger Size. White Card Stock. Alkaline/acid-free manufacturing for permanence Smooth Finish / 96 Brightness - 270 GSM (100lb Cover) Excellent opacity for minimal show-through Perfect Use for Laser, Ink Jet and Offset Application.