Package of 50 Cover Plates, diameter 33mm Back Catalog number: 435028 Manufacturer: HYDRO-BIOS Availability: In the manufacturer's stock Price on request - + Recommended 435021 Tubular Plankton Chamber, capacity 5ml Price on request 435098 Set of 10 Spare Dilution Bottles 250ml Price on request 438001 Surface Plankton Net acc. to Apstein Price on request