100% cotton, beige, impregnated with starch (stiffened), fabric construction of Ypsilon (single thread): warp 9.5 threads (Nm 60)/cm, weft 6.5 threads (Nm 60)/cm; fabric construction for Beta (2 threaded); warp 17.5 threads (Nm 60)/cm, weft 7.0 threads (Nm 60)/cm; coating: acid-free tissue paper ca. 30 g/m²; usable width: 980 mm (Ypsilon) and 1380 mm (Beta)