You will also receive 4 classifiers in mesh size 20, 30, 50 & 100 it is highly recommended to classify your material to #30, #50 & #100 mesh for the blue bowl to work properly! purple: mesh 20 - hole size: 0.05" red: mesh 30 - hole size: 0.03" teal: mesh 50 - hole size: 0.02" orange: mesh 100 - hole size: 0.01" the mesh screens are made with high quality stainless steel mesh & has a sidewall reinforcement made