Bonsai Jack 1/4 inch Horticultural Charcoal. 3.5 Gallons 100 percent satisfaction guarantee Bonsai Jack products are tested and backed by real science. Made in the USA Tested and backed by real science. Available in 2 Quart, 1 Gallon, 2 Gallon, 3.5 Gallon, 7 Gallon, 14 Gallon and 28 Gallon SKUs