This is two extra reinforced diffuser adapters with standard ground SG 29/19. The dual diffuser adapters consists of two detachable adapters each with slit. The inner adapter has a 5-arm 10x slit diffuser and the external adapter has a 12x slit-diffuser. This provides powerful turbulence and cools the smoke optimally. The 'Blaze Glass' logo in silver is positioned on the outer tube.