The New Athabasca 4 stop Blade reverse graduated ND filter features a unique SUPER THIN 1.1mm design that is impact resistant which is a world first for square filters. 

Features:

– Tempered glass offers impact resistance which is a world first that you will appreiciate.
– Double sided coating on opticaly enhanced glass providing industry best features.
– Nano Anti Reflective coating, providing incredible Scratch resistance realising an optically superior filter.
– Stain and water resistant square filters that are easy to clean. Be assured that any water droplets from the environment will not affect  Athabasca coatings.             
– Blade 4 stop RGND filters provide an amazing low reflections and light reducing layer.
– Thinnest and most lightweight 4 stop filters in the world weighing at only 39g for GND filters. Being so lightweight and durable means a greater experience in travel. You can take these with you and not have to worry about adding on much weight to your kit.