16" diameter, 16" height -The Basalt Birdbath looks so natural, you'll think Mother Nature herself carved it out of the landscape. -Created from natural columnar basalt, the basin features a textured interior finish with a natural finish left on the sides and stone base. -Columnar basalt is dark grey in color and as resilient as granite. -This piece will become even more beautiful with age. -Highly durable basalt is virtually indestructible.  Use year-round with a Birdbath Heater -Made of two pieces.  No two of these birdbaths are exactly the same. Add a Layered Waterfall Bubbler or Floating Solar Bubbler to move the water and attract more birds.