how to make the brick invisible?

wait(2)
workspace:WaitForChild("PartStorage")

while true do
    wait(1.5) -- How long in between drops
    local part = Instance.new("Part",workspace.PartStorage)
    part.BrickColor=script.Parent.Parent.Parent.DropColor.Value
    part.Material=script.Parent.Parent.Parent.MaterialValue.Value

    local mesh = game.ServerStorage.Mesh:clone() -- This clones the mesh,
    mesh.Parent = part   -- Into the part!

    local cash = Instance.new("IntValue",part)
    cash.Name = "Cash"
    cash.Value = 5 -- How much the drops are worth
    part.CFrame = script.Parent.Drop.CFrame - Vector3.new(0,1.4,0)
    part.FormFactor = "Custom"
    part.Size=Vector3.new(1, 1, 0.25) -- Size of the drops 
    part.TopSurface = 0
    part.BottomSurface = 0
    game.Debris:AddItem(part,20) -- How long until the drops expire
end

ok so a brick comes out along with the item i wish just need to make the brick invisible please help!