The Dual MeshLine to Octo perc bongs by 2K Glass Art are the best of the best. Each piece is handmade with precision for the best smoke diffusion possible. The gridded dual MeshLine perc will stack bubbles on bubbles. Along with the 8 arm tree perc you are getting the second chamber bubbling away. The 4-hole screen slide guarantees a get a big hit! Just open the box and get started, as this piece comes complete and ready to use.