Top Fin Silenstream PF-S Small Filter Cartridges (6 Count) Refill for PF10 Power Filters (5.5in x 3.1in)

They go in a fish tank!

product as described

Cheap and fits perfectly.

Fit in my 10 gallon tank from petsmart

Yup, they are top fin fish tank filters, fit my 10 gal bow front perfect. The fish have not complained.

fits well in my silent stream filter

Good

These are easy to use and easy to replace in my water filter for my fish tank. No issues. Great filter.

This is the correct filter refill for my tank. It fits. It works. Price is a little higher than buying from a chain pet store.

The filter and media are self-contained. It fits and works as expected. The change rate is as to be expected as well.