McDonald's knows the struggle of getting the perfect combo of flavors in every sip of a Shamrock Shake, and they know that this will be even more of a problem with the new Chocolate Shamrock Shakes. Enter the STRAW. They invented a limited edition STRAW (Suction Tube for Reverse Axial Withdrawal) for optimal Shamrock Shake enjoyment. They are only available in certain locations for a limited time, so they are pretty exclusive.