An edit to my original review, having used the filters several times now.Seller really helpful and friendly and the product arrived very quickly! This remains the case with the seller contacting me recently with more advice on how to use the filters.Need to be careful and not use the filters in combination - I found the polarising filter gets stuck on the UV filter and it's really hard to unstick! This is a fact - you can use them together but you need to take care and not screw them together tightly. This makes using the polarising filter a little tricky (when in combination with another filer - but with practice it works.Polarising filter would benefit from a scale on the side so you know what level of polarisation you are getting - otherwise it's a bit trial and error! Have used this filter for a while now and yes a scale would be helpful but I've learned where the max and min effect are now.ND4 isn't very strong. Nothing wrong with the filter itself - just as well put together and robust as the others - but it's just ND4 doesn't have a very strong effect. I should have done more research!Cleaning pen is good and useful to have a case but the materials are a little abrasive so pack filters in cleaning cloths I'd say.The filters them selves seem sturdy. Very good value for a novice.