Thick Cardboard for Handmade Book Binding. 4 Sheets of 2mm Thick

20pcs Thick Durable DIY Hand Account Hard Cardboard White Black Brown Color Paper For Postcard Sketch Card 14.6x10.5cm - AliExpress

Drafting Board - UK

Bookbinding Card - UK

Cardboard Sheets

Bookbinding Kits - UK

A4 Size Thickness 1.5mm Kraft Chipboard Cardstock Cardboard For Paper Craft Cardmaking - You Choose Quantity

Cardboard Sheets

Cardboard Doll Box - UK

Bookbinding Kits - UK

MAGICLULU 10 Pcs Chip Board, 11.6 x 8 Cardboard Sheets Book Board Binder Board for Book Binding Crafts Scrapbooking Picture Frame(Thick 2.5MM)

Thick Cardboard - UK

Rigid Cardboard Box - UK