Sienna Plein Air Pastel Insert Large (CT-PP-0912) Pastel box insert is an accessory for the sienna plein air pochade box Pastel box will accommodate a range of different pastel lengths and widths Vertical divider helps with organization - keeping colors separate Pastel box is held in place with the large set of palette blocks included The box has two storage compartments that each measure 4 _ x 6 _