Made of 2.5 mm thick cardboard, coated with high-quality PEVA. Resistant to high temperatures and elastic. Free of harmful substances for health and compliant with REACH and DIN EN71 regulations. 4-ring mechanism with 8 cm spacing. Available in the version with 3 customizable external pockets (front, back, and rear) and 2 pockets located inside the covers. External size 30 x 32 cm for A4 Maxi use. Color white.