The Celestron PowerSeeker Accessory Kit is a great way to expand the enjoyment of your telescope. Inside the plastic foam-lined carry case youll find these accessories: 15 mm Kellner Eyepiece - 1.25 9 mm Kellner Eyepiece - 1.25 #80A Blue Filter - 1.25 #25 Red Filter - 1.25 Moon Filter - 1.25 Microfiber Cleaning Cloth Eyepieces - The 15 mm and 9 mm eyepieces can be used in any telescope with a 1.25 focuser. Each eyepiece is fully coated to improve light transmission and protect the optics. The 15 mm Kellner eyepiece offers a nice medium magnification view in most telescopes and the 9 mm provides high magnifications great for the Moon and planets especially when seeing conditions are good. Filters - Colored filters can be used to bring out certain details on a planets surface or its cloud structure. Both planetary filters as well as the Moon filter can be used on any 1.25 eyepiece with the proper filter threads so they are very versatile. Just screw one onto your eyepiece of choice and slide it into the focuser. The #80A is a medium-blue filter that enhances the contrast of the cloud belts on Jupiter and the polar ice caps on Saturn. It also can be used to increase contrast on the Moon if you dont mind the color shift. The #25 filter is a deep red color and is a good choice when you want to define the polar ice caps on Mars. Its also fun to use this filter when observing Jupiter. The #25 Red filter blocks quite a bit of light coming through your telescope however so it is best used on bright objects with larger aperture telescopes. The Moon filter is one of the first accessories most new amateur astronomers buy and for good reason! It helps block out a portion of the light the Moon sends into your eyepiece so that you can see details better. You can also try this filter on Venus; it helps you see which phase shes in. Cleaning Cloth & Case - Keep the microfiber cleaning cloth stashed in your PowerSeeker Accessory Kit case so that it will always be handy. Its better to use a microfiber cloth on your optics than wipes or tissue as it will not leave a residue and can be reused. Remember to blow or brush any dust particles off of your optics before rubbing them with the cloth. The black plastic carry case has die-cut foam inside to protect and cushion your accessories. Keep each one in its appointed place when not in use and youll keep them looking and performing like new.