Grids are color coded for convience.
5 x 10 cm (5 x 4 Inches) Quantity per Pack: 4Shipping Weight: 7. Extra Grids for Switch-Grid Tube Racks, Green Grid, 4 PK Description: Set of 4 Grids, Green Tube Size: 16 - 20 mm Places: 20 Rows: 5 x 4 Dimensions: 12.