New Brand And High QualityColor:BlueQty:4/6/8(Choice)You are looking at Z type foam filters that are compatible with many models of inflatable hot tubs. Please be warned, you will see many misshaped versions of these filters for around the same price like square or hexagonal. They are this shape because they are cheaply made and obviously not as good fitting as the round types that give a more consistent surface area. they are also unusually thick which obviously restricts water flow putting excessive strain on your pump. Why put a thick hexagonal lump of foam in a housing designed for round filters?These are much cheaper than the original filters, much more free flowing and I find they filter much better.i have managed to source round filters rather than the cheaper misshaped ones that are for sale elsewhere. these will filter water much better due to the consistent surface area and are proven to be a better fit. These filters do require more attention and I recommend using Bromine as this chemical is odourless, cheaper, better for your skin and much more filter friendlyIf you do choose to use Chlorine i strongly recommend changing these filters weeklyPlease note these filters will lose some colour through use.. This is completely normal and is nothing to panic about. other sellers colour their foam green to hide this, however I believe in being completely transparent with my customers Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store