AssemblyMass
ReadOnly
This property can only be read from. Attempting to write to it will cause an error.
NotReplicated
This item is not replicated across Roblox’s server/client boundary.
The sum of the mass of all the BasePart|parts in this part’s assembly. Parts that are BasePart/Massless|Massless and are not the assembly’s root part will not contribute to the AssemblyMass.
If the assembly has an anchored part, the assembly’s mass is considered infinite.
Constraints and other physical interactions between unanchored assemblies with a large difference in mass may cause instabilities.