Messy coffee stations are grounds for frustration. This bottle simplifies the Ross Droplet Technique process. Spray your beans once before grinding and kiss the mess goodbye. Bottle is made of glass and holds 10ml. It's much taller than the shorty RDT bottle. There's an option to add a bottle holder - this is black bottle caddy made of ABS plastic. It sticks permanently to any smooth surface using 3M VHB tape.