100% Brand new and high quality Color: Blue Quantity: 4 pcs You are looking at Z type foam filters which are compatible with many models of inflatable hot tubs. Please be aware that you will see many warped versions of these filters for around the same price as the square or hexagonal ones. They are shaped this way because they are cheaply made and are obviously not as good as the round types which provide a more consistent surface area. They are also unusually thick which obviously restricts water flow and puts a lot of strain on your pump. Why put a thick hexagonal foam block in a housing meant for round filters? I used the original filters myself for around 12 months and noticed that they only lasted around a week. They were almost impossible to clean. More importantly, they cost me a fortune. I decided to look for a foam alternative and after around 6 months of testing, settled on filter media as you can see from this listing. I have been using them ever since with no problems whatsoever. These are much cheaper than the original filters, they flow much more freely and I find that they filter much better. I've managed to purchase round filters instead of the cheaper, misshapen ones sold elsewhere. These filter the water much better thanks to their smooth surface and have proven to be more suitable. These filters require more attention, and I recommend using bromine, as this chemical is odorless, cheaper, better for your skin, and much more harmless to the filter. If you decide to use chlorine, I highly recommend changing the filters weekly. Please note that these filters will lose some color with use. This is completely normal and nothing to worry about. Other sellers dye the foam green to disguise this, but I believe in being completely transparent with my customers. Buying our products not only means owning high-quality products but also enjoying our meticulous customer service. Our customer service is always ready to provide help and support. With the concept of customer first, we provide 24/7 customer service. No matter where you are or what problem you have, we will solve it as soon as possible to ensure a worry-free shopping experience.