Material : Iron Dimension: Small: 10 cm x 20 cm / 4 in x 8 in Large: 15 cm x 30 cm / 6 in x 12 in Double layer A: 15 cm x 30 cm x 19 cm / 6 in x 12 in x 7.5 in Double layer B: 15 cm x 30 cm x 25 cm / 6 in x 12 in x 9.8 in