Rotation model1 help? [Script Included]

--Vividex
local sp = game.Workspace.DBlueStrobe.Model1.Cylinder
local s = game.Workspace.DBlueStrobe.Model1.L
local ss = game.Workspace.DBlueStrobe.Model1.L1
local sss = game.Workspace.DBlueStrobe.Model1.L2
while true do
    for z = 30,-30,-15 do
        local to = CFrame.Angles(-180,0,z);
        sp.CFrame.Angles = to;
        s.CFrame.Angles = to;
        ss.CFrame.Angles = to;
        sss.CFrame.Angles = to;
        wait(0.1);
    end
end

Its supposed to rotate the 4 objects at the same time, but it doesnt. Output: 16:43:57.675 - Angles cannot be assigned to Help please?