ITEM: New Medium Horticultural Grade Pumice for Cactus Succulent, Bonsai Tree Soil Mix - 100 % natural volcanic rock, the best additive for cactus succulent, bonsai soil mix. - The porosity of rocks helps retain moisture and provids excellent soil aeration. - Sifted prior to bagging, the pumice rock is clean and of consistent size. - Product of USA PLEASE NOTE: This product contains a small amount of debris, is a normal phenomenon, since the transport process can not avoid friction, pressure and other circumstances lead to some of the powder situation. Thank you for your understanding GRAIN SIZE: MEDIUM Particles are approximately from 3/8" to 1/2" ( 6.0 mm - 10.0 mm ) VOLUME: US DRY GAL. 1 Quart = 4 Cups = 0.25 Gal. 2.5 Quarts = 10 Cups = 0.625 Gal. 2 Gal. = 8 Quarts = 32 Cups 3 Gal. = 12 Quarts = 48 Cups SHIPPING: Soil's mix shipment cost cannot be combined with other items.