Each piece include 4 layers:
Bacterial/Viral Filtration (3):
7 inches of height to prevent unnecessary strain and weighs 2
product unique is its dispersibility: it easily breaks down back to fibers as it goes through the pipes
No sharp edges or cold chain
Welch Allyn PocketScope Ophthalmoscope, Various Options masks Each piece include 4 layers:WELCH ALLYN PocketScope Ophthalmoscope Halogen light for true tissue color and consistent, long lasting illumination 12 aperture filter combinations for greater versatility: micro, small, and large spot sizes, cobalt blue filter for corneal exams, fixation target, and slit aperture, plus red free filter and unfiltered halogen 48 focusing lenses for better resolution Options inlcude: 12181 2 Alkaline AA Battery Handle, Soft Storage Case 12820 2