Top Fin Retreat RF-S Filter Cartridges (Small) Refill for Desktop Aquariums with Small Retreat Filters - 8.1in x 1.9in (6 Count)

They are the filters made to fit my small aquarium. Shipping and delivery was prompt. Will order again.

Good packaging, easy to use

Usability

I have been looking for these filters in every single pet store I could find and amazon seems to be the only place that carries them. Very happy with purchase they work great.