9.5" Tree-Arm Diffuser Bent Neck Glass BongThe 9. 5" Tree Arm Diffuser Bent Neck Glass Bong with percolator comes in a bundle pack of 2 because we know how clumsy people can be with their fragile glass bongs! Enjoy an extremely smooth hit as the diffuser offers proper smoke filtration while the percolator provides additional filtration to give you one of the smoothest hits you can get from a small bong like this. 9. 5" Tree Arm Diffuser Bent Neck Glass Bong Details 2 Per Box Quality