Based on this product's specifications, here are some alternatives and similar models
Technical Drawing Block Leviatan A3 10k White – 352214
Summary description:
Leviatan technical drawing block A3, 10k sheets, white. Paper block designed for technical sketches, drafts and engineering drawings in A3 format. Provides a consistent white surface suitable for pencils, pens and markers. Ideal for architects, designers, engineers and students for concept sketches, plans and project documentation.