diff --git a/saveinstance.luau b/saveinstance.luau
index 3505334..e68f581 100644
--- a/saveinstance.luau
+++ b/saveinstance.luau
@@ -569,11 +569,11 @@ Binary_Descriptors = {
 	["PhysicalProperties"] = function(raw) -- ? Not sure yet (https://github.com/RobloxAPI/spec/blob/master/properties/drafts/AttributesSerializeFull.md#physicalproperties)
 		local len = 1
 		if raw then
-			len += 20
+			len += 24
 		end
 		local b = buffer.create(len)
 
-		buffer.writeu8(b, 0, raw and 1 or 0)
+		buffer.writeu8(b, 0, raw and 3 or 0) -- 3 means it has set CustomPhysicalProperties & has set AcousticAbsorption
 
 		if raw then
 			buffer.writef32(b, 1, raw.Density)
@@ -581,6 +581,7 @@ Binary_Descriptors = {
 			buffer.writef32(b, 9, raw.Elasticity)
 			buffer.writef32(b, 13, raw.FrictionWeight)
 			buffer.writef32(b, 17, raw.ElasticityWeight)
+			buffer.writef32(b, 21, raw.AcousticAbsorption)
 		end
 
 		return b, len
@@ -886,6 +887,7 @@ XML_Descriptors = {
 			Elasticity
 			FrictionWeight
 			ElasticityWeight
+			AcousticAbsorption
 
 			The value of each component is represented by the text content formatted as a 32-bit floating point number (see float)
 		]]
@@ -893,7 +895,7 @@ XML_Descriptors = {
 		local CustomPhysics = "<CustomPhysics>" .. XML_Descriptors.bool(raw and true or false) .. "</CustomPhysics>"
 
 		return raw
-				and CustomPhysics .. "<Density>" .. raw.Density .. "</Density><Friction>" .. raw.Friction .. "</Friction><Elasticity>" .. raw.Elasticity .. "</Elasticity><FrictionWeight>" .. raw.FrictionWeight .. "</FrictionWeight><ElasticityWeight>" .. raw.ElasticityWeight .. "</ElasticityWeight>"
+				and CustomPhysics .. "<Density>" .. raw.Density .. "</Density><Friction>" .. raw.Friction .. "</Friction><Elasticity>" .. raw.Elasticity .. "</Elasticity><FrictionWeight>" .. raw.FrictionWeight .. "</FrictionWeight><ElasticityWeight>" .. raw.ElasticityWeight .. "</ElasticityWeight><AcousticAbsorption>" .. raw.AcousticAbsorption .. "</AcousticAbsorption>"
 			or CustomPhysics
 	end,
 	-- ProtectedString = function(raw) return tostring(raw), "ProtectedString" end,