From the link you gave me, I made a script and copy and pasted this code into each block:
local part = script.Parent
-- The properties to set
-- This will make the part light and bouncy!
local density = .3
local friction = .1
local elasticity = 1
local frictionWeight = 1
local elasticityWeight = 1
-- Construct new PhysicalProperties and set
local physProperties = PhysicalProperties.new(density, friction, elasticity, frictionWeight, elasticityWeight)
part.CustomPhysicalProperties = physProperties
I did nothing else, I just added it to a regular part.
Do remember that I am not aware of how to script at the moment.