uxcell Aquarium Filter Biochemical Sponge Foam Replacement Black Color: Black; Package Content: 1 x Aquarium Filter Sponge Total Size: 12 x 11cm/ 4.7" x 4.3"(D*H); Material: Sponge Product Name: Aquarium Filter Sponge Net Weight: 28g Center Hole Dia: 28mm/ 1.1"