Set includes 11 quality glass lenses: 1 each PCX, DCX, BCX, PMN, DCV, PCV, BCV, NMN, ASP, ACH, and TRP. Each is in separate envelopes labeled. We constantly get inquiries about the difference between lens types and what they are used for. With this set you'll be able to see first hand the difference, and we'll include some information to help you with your creative optics projects. You will receive items that are in our regular stock. The cost if purchased seperately at our very low surplus prices is $49.50 and would cost you hundreds of dollars elsewhere. Get 2 or more sets to share with your friends, associates, students or kids and get those creative juices flowing.