A deep tissue massage tool ergonomically designed to protect practitioners from occupational injuries. It allows therapists more focused deeper work with less physical effort. 100% Natural Black Basalt; Excellent for holding heat for long periods of time;Rich with iron and magnesium. Shaped and polished by traditional handcraft, no wax, dyestuff, chemicals were applied. Size: 5" x 1.8" x 1.2", 2 Pieces per Box.