To send as a letter size the a4 sheets will be folded making 4x a5, or two folded a4 sheets.
Model Railway Concrete Texture Modelling Card 00 OO to 0 O Scale A2 4xA4 170gsm
Model Railway concrete texture Sheet A4 self adhesive x2
Model Railway Concrete Texture Modelling Card 00 OO to 0 O Scale - A4 size X5
Model Railway cobblestone texture Sheet A5 self adhesive x10 (SCS)
MODEL RAILWAY LAYOUT TEXTURE MODELLING : BEST PRACTICE TIPS & TECHNIQUES BOOK
