Especially with 250gsm and 300 gsm, which are quite a stiff cards. A5 148mm x 210mm (5.8" x 8.3"). A2 420mm x 594mm (16.5" x 23.4"). GSM is the weight of the paper, not the thickness. CIE Whiteness (ISO 11475) - 145%.
Size A5 White Matte Thick Paper Card 240gsm Cardstock For Water Color Cardmaking 10/20/50 - You Pick - Cards & Card Stock - AliExpress
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220GSM 4K 380X530mm (15X20.9 inch) Multifunction Colorful Cardstock Card Stock Colored Paper for Handcraft Copy Paper Printing Paper 50 Sheets/Bag-Buff - China Cardstock, Card Stock
Cardstock Paper - UK
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House of Card & Paper A5 300 GSM Card - White (Pack of 100 Sheets) : Office Products
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A2 A3 A4 A5 A6 WHITE CARD THICK PAPER CARDBOARD PRINTER COPIER SHEETS GSM CRAFTS
GSM Paper and GSM Card What does GSM Mean When Buying Paper & Card?
100 X A4 Premium Thick White Printer Craft Card 300gsm by Ark for sale online
Gateway A4 112 GSM 250 Sheets Natural Tracing Paper for sale online