Mccool Universal 37MM ND Filter Camera Lens with clip Kit Adjustable Fader Neutral Density (ND2 - ND400) Super Slim for mobile phone Kit for Iphone 6 Plus 5s 5, Samsung Galaxy S6 S5 (nd)

Awesome ND filters but I actually bought a 37 to 52mm adapter and bought ND1000 52mm filter. The ND filter the kit comes with is not dark enough in full sunlight so if you need an ND filter to do like 15 second or longer long exposure photography, you will need to get an adapter and 52mm ND1000 filter. You can also get 37mm ND1000 filter but it's way more expensive than getting the adapter and 52mm lenses.