The sponge filter ball is a practical accessory for pool to absorb small dirt, eco-friendly and non-toxic, elastic and reusable. It can make your pool clearer and healthier. Features: Made of sponge material, eco-friendly and non-toxic, elastic and reusable. Surface special structure, easy to filter and absorb small dirt. Easy to use, just throw it into filter basket or directly in pool. Suitable for swimming pool, spa, bathtub, etc. Easy to clean, machine wash friendly. Specifications: Material: Sponge Color: White Quantity: 4Pcs, 8Pcs (optional) Item Size: 60 * 60mm / 2.36 * 2.36in Package Weight: 4Pcs: 8g / 0.28ounces 8Pcs: 16g / 0.56ounces Package Size: 4Pcs: 72.8 * 64.6 * 29.5mm / 2.87* 2.54 * 1.16in 8Pcs: 140 * 130 * 29.5mm / 5.51 * 5.12 * 1.16in Packing List: 8 * Filter Balls