Encourage creative design combinations with pattern blocks! Each tray is made of sturdy plastic. Pattern blocks sold separately. Triangle tray sides measures 13.9"". The Hexagon tray sides measure 6.5"" L. Lips on trays keep pattern blocks from sliding off. Can be used with plastic and wood pattern blocks and both thicknesses (.5 cm and 1 cm).- Triangle tray sides measures 13.9"". The Hexagon tray sides measure 6.5"" L.- Lips on trays keep pattern blocks from sliding off.- Can be used with plastic and wood pattern blocks and both thicknesses (.5 cm and 1 cm).- Each tray is made of sturdy plastic.- Sold as 2 pieces/Set..