Perfect for sorting pieces out. How ever you sort them

210mm x 165mm at widest points

They are made in a  PLA plastic, various colours available 

( PLA plastic is a vegetable-based plastic material, which commonly uses corn-starch or sugarcane as a raw material. The monomer is usually made from fermented plant starch. This material is a thermoplastic aliphatic polyester and it is the primary natural raw material used in 3D printing. PLA is a fully biodegradable thermoplastic polymer consisting of renewable raw materials.)