ZOMEi 62mm ND2-ND400 Ultra Slim Fader Variable Neutral Density Adjustable Lens Filter Ultra Slim ND Filter Optical Glass Double anti-reflective coating, only 7mm thickness ultra thin frame Adjustable ND filter can be adjusted between 2-400 ,the index marks on the filter let you know exactly the amount of reduction at a glance. Giving you clear and precise shots at whichever density you are using Frame made of high quality aircraft-grade aluminum manufacturing, comfortable feel