Package of 50 Cover Plates, diameter 33mm Back Catalog number: 435028 Manufacturer: HYDRO-BIOS Availability: In the manufacturer's stock Price on request - + Recommended 438001 Surface Plankton Net acc. to Apstein Price on request 438040 Plankton Net for quantitative collection with cowl Price on request 438025 Spare Net Bucket for Plankton Nets No. 438 001 / 4 Price on request