BasePart.AssemblyMass

Read Only
Not Replicated
Read Parallel

The sum of the mass of all the BaseParts in this part's assembly. Parts that are 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.