This is a large 4" diagonal to diagonal 7 segment display. It uses 20 5mm LED's and the colours are completely your choice. In my version, i built it with 20 bi-coloured (Red and Green) LED's which had a diffused lens. This is great to use on walls and makes an awesome clock, temperature monitor or maybe use it to display the number of unread emails in your inbox! There are 6 files that make up this display however some parts need to be printed twice. Print the 7_Segment_Display_Frame, 7_Segment_Dot and 7_Segment_G stl files just ONCE. The rest of the parts need to be printed TWICE each. You will notice that the file name corresponds to the correct layout of a generic 7 segment display For the electronics, I've provided an Instructable which you can view here: http://www.instructables.com/id/4-Seven-Segment-Display/