Base MDF nogal americano. Sus medidas son:

B8 (30.5 x 38 cm ó 12" x 15")

B7 o diploma (27 x 33 cm ó 10.5" x 13")

B6 o florentino (23 x 30.5 cm ó 9" x 12")

B5 o foto (20 x 25 cm ó 8" x 10")

B4 (18 x 23 cm ó 7" x 9")

B3 (15 x 20 cm ó 6" x 8")

B2 (13 x 18 cm ó 5" x 7")

B1 (11 x 15 cm ó 4 1/2" x 6 1/2")