Cobalt Micro Ceramic Rings are ideal for boosting biological filtration in any filtration system. The rings are extremely porous, providing tremendous surface area, yet small size makes then practical in any application. Each individual ring is approximately 0.4" in diameter x 0.435" long.
They are ideal for use in reef, marine and freshwater applications. Micro Ceramic Rings provide 13700 cubic feet of total surface area. Media bag included.