Nature's Aquatic Planting Pressure Clips 6.5 inches for Planted Aquarium Tanks Stainless Steel Pressure clips provides a controlled placement of thick plants with ease. Great for use to clamp strings to tie aquatic plants. 6.5 inches in length Perfect for Nature's Pure 6x6x6 inch or 7x7x7 inch Cube or Cylinder Aquariums. Not suitable for use with fragile aquatic plants.