5 Piece Wire Base, Plastic outer Sieve, Classifier.

Mesh Sizes Include:

• 1/2 Inch 12.7 mm 
• 1/4 Inch  6.35 mm
• 1/8 Inch  3.18 mm
• 1/12 Inch 2.11 mm
• 1/20 Inch 1.27 mm

They are stackable and fit into a standard white bucket.

Good quality Mesh and hard Plastic.