The unique housing stays in your string and you can quickly and easily change aperture sizes, with or without a clarifier lens.  The apertures with lenses are a smaller version of the Excalibur lens.  They, too, are optically centered and permanently secured in the aperture.  A lens in the peep is used for either of two purposes.  To clear up the image when using a scope, this is called a standard clarifier or add more magnification to the scope, this is called a power peep.  37 degree fits bows shorter than 40", 45 degree fits bows longer than 40".  The Super Ball Peep Kit does not include a clarifier. Each kit includes housing wrench

Option 1 - 37 degree & 1/32", 3/64", 3/32", 1/16", 1/8" apertures

Option 2 - 45 degree & 1/32", 3/64", 3/32", 1/16", 1/8" apertures

Option 3 - 37 degree & 3/64", 1/16", 3/32" apertures

Option 4 - 45 degree & 3/64", 1/16", 3/32" apertures

Option 5 - 37 degree & 1/16", 3/32", 1/8" apertures

Option 6 - 45 degree & 1/16", 3/32", 1/8" apertures