Filter sock question

[Vic_java]

I had a Neptunian cube installed last week and it came with the following filter socks that appear to be lined with fleece. I really like them as they help to make my tank silent. Does anyone know where I can find more? They’re 4 inches in diameter and about 5-6 inches long.

 

[WrasseyReefer]

I had a Neptunian cube installed last week and it came with the following filter socks that appear to be lined with fleece. I really like them as they help to make my tank silent. Does anyone know where I can find more? They’re 4 inches in diameter and about 5-6 inches long.

Those look nice! Haven’t seen anything like that on Amazon or BRS. Following.