The filter thread size of Olympus M.Zuiko Digital 14-42mm f3.5-5.6 II R is 37mm.
Below are links to the filters that we recommend you to consider for your Olympus M 14-42mm f3.5-5.6 II R:
Read our detailed Olympus M.Zuiko Digital 14-42mm f3.5-5.6 II R Review