$contents
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$contents is a c0 available in all 
Source games. It specifies a list of the contents types to use for SolidMask tests during non-hitbox traces.
- This feature was specifically added to allow us to make things like fences out of props instead of brush models.
- See also $jointcontents.
Example
$contents "monster" "grate"
- Available content_types are:
grate- Makes it a grate.
- (Grates are not solid to bullets or line of sight, but solid to everything else.)
monster- Marks it as an NPC.[Why?]
notsolid- Makes it not solid to anything.
solid- Makes it solid.
- Solid is the default value, so this parameter is usually used only for the $jointcontents command, to make a solid child of a non-solid parent.
ladder- Makes it a ladder.
Note:Additional contents from bspflags.h can be set via 
Source Model Skin Editor, although results may vary.