The Autoguide Stab Incision and Visualase Height Guides {MQ}do not contain lumens or cannulationsHeight Guide shaft is 17-4 stainless steel and the C-clip is Nitronic 60 steelThe {MQ}Autoguide Stab Incision and Visualase Height Guides surface finish is smooth and do not contain rough surfacesThe Autoguide Stab Incision Height Guide has a surface area of 33 cm2 and none of the materials are porousThe Autoguide Visualase Height Guide has a surface area of 49 cm2 and none of the materials are porous