What you are purchasing:Single strips of (15) individual vinyl decals to fit in each space of your picatinny rail. Approximate size to fit any picatinny rail. These vinyl inserts are applied in between the posts of the rails that attachments are anchored to.Picatinny rails also differ in size, so in order to purchase the correct amount, please count how many spaces you have on each rail. i.e. " I have a quad rail that has 23 spaces on each rail " there for you have 92 spaces available to insert your desired color/colors. When purchasing remember that these strips are in increments of 15, so if you need 92 you would order 7 sheets. However you will notice you have some left over. This is good, so you have extras to put on another rifle or so you have extras in case of mistakes. Each order of P.R.V. Inserts comes with a tac-pick used to help with the application of laying the vinyl on the rail. Also, we will include an instructional video to help assist you with y