Single Magnetic Frag Rock – Artificial Frag Mount for Aquarium & Reef Tanks Dimensions: 3.25″ x 2.25″ x 2″ Material: Reef-Safe Urethane Resin This single magnetic frag rock provides a natural-looking mounting surface for coral frags while allowing placement on aquarium glass. Its compact size makes it easy to position frags exactly where needed without disrupting the overall aquascape. The textured rock surface supports coral attachment and encourages natural encrusting over time, helping frags blend naturally into the surrounding reef structure.