Inline Bong Leanback NautilusIntroducing the leanback Nautilus forming part of the Inline bong series by Black Leaf. This stemless glass bong contains a 14 slit cobalt blue inline percolator along the bottom. It is supported by a stable round base and the large glass bowl fits onto an 18. 8mm ground joint. Once smoke is passed through the inline percolator it rises up through a one hole disc into a lean back style tube that is bent for ease of use.