The Mini Dual MeshLine to Mini 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 mini dual MeshLine perc will stack bubbles on bubbles. Along with the Mini 8 arm tree perc you are getting the second chamber bubbling away. The One-hole slide guarantees you get a big hit! Just open the box and get started, as this piece comes complete and ready to use.