The beauty of the wood grain of these propagation stations gives them a unique style. These products were made with Walnut wood & the tubes are made of glass. To bring out the grain of the wood, I used natural oil for wood. What is included: 1 Propagation Station & 2 Glass Tubes. As an option, you can purchase glass tubes to replace one you might have broken. Replacement tubes are only available when you purchase a Propagation Station. Dimensions: Item A: Height: 2 7/8 inch - Width: 5 1/4 inch - Depth: 1 7/8 inch Item B: Height: 2 7/8 inch - Width: 5 1/8 inch - Depth: 1 5/8 inch Item C: Height: 2 7/8 inch - Width: 5 1/8 inch - Depth: 1 5/8 inch Item D: Height: 2 7/8 inch - Width: 5 1/4 inch - Depth: 1 7/8 inch Item E: Height: 2 7/8 inch - Width: 4 1/2 inch - Depth: 1 5/8 inch Propagation Station - 2 Holes Block Walnut Wood & Glass Tubes