Formatt-Hitech 100mm Resin Neutral Density Mixed Starter Kit with 72mm Adapter Contains 0.6 and 0.9 ND Soft Edge Grad filters in addition to a 67mm adapter Includes an exclusive Filter Basics Booklet High scratch resistance, low material fatigue, and chamfered corners to resist breakage so the filter will provide years of service Available in three sizes 67mm, 85mm and 100mm. Made in the UK on the most advanced computer-controlled manufacturing equipment in the industry.