Designed by professionals who work in the industry, Rockin Foam is extremely dense for secure rock placement in virtually any formation. The patented dispersing trigger lets you hold the can at any angle as you dispense, including sideways and upside-down. And because Rockin Foam is a minimal expanding foam, you have better control and less excess foam to trim away. Rich, carbon based black color blends quickly with rocks and visually disappears behind flowing water while reducing ultraviolet deterioration, so it lasts longer. Rockin Foam is non-toxic and safe for aquatic plants and animals, including fish. Available in a convenient, value-sized 20-ounce can.