import clr
clr.AddReference("RevitAPI")
import Autodesk
from Autodesk.Revit.DB import *
from System.Collections.Generic import *
 
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *
 
clr.AddReference("RevitNodes")
import Revit
clr.ImportExtensions(Revit.Elements)
 
clr.ImportExtensions(Revit.GeometryConversion)
 
clr.AddReference("RevitServices")
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager
from System.Collections.Generic import *
 
doc = DocumentManager.Instance.CurrentDBDocument
 
mats=UnwrapElement(IN[0])
den=[]
for mat in mats:
	matid = mat.StructuralAssetId
	density=(doc.GetElement(matid).GetStructuralAsset().Density*35.314666666666)
	den.append(density)
OUT = den