Quantity: Set of 4 Replacement filters for NPET Cat Water Fountain NC010 31-101-15, ✼••┈┈┈┈••✼••┈┈┈┈••✼••┈┈┈┈••✼ ■ Instant purchase and silent purchase are welcome! → #ToyBox's bargain product list ■ Follow discount and bundle discount available (See profile for details) ■ Price negotiation OK ◎ Feel free to comment! ■ Please check the actual photos for the condition of the product. ■ Please read the profile before purchasing and check for any unclear points.