Sand Pebbles Size 25.0 To 40.0 Mm , Sand Pebbles 20 12Mm , Quartz Pebbles Size 6.0 To 12.0 Mm , Sand Pebblessize 3.0 10.0 Mm , Crushed Gravel Size 2.0 To 6.0 Mm ,Quartz Sand Filtering Sand , Anthracite Coal , Activatedcarbon , Voc Activated Carbon Quantity: 403000