Package of 50 Cover Plates, diameter 33mm Back Catalog number: 435028 Manufacturer: HYDRO-BIOS Availability: In the manufacturer's stock Price on request - + Recommended 438030 Plankton Net for qualitative collection Price on request 435100 Folsom's Plankton Sample Divider Price on request 435023 Tubular Plankton Chamber, capacity 25ml Price on request