At TLC Lab Supply We have most of our products made for us directly from the manufactures for quality control, we recently have included a TLC manufacturing plate company in the USA to make us plates that will get the best possible results for our TLC test kits (not all TLC plates are the same) which will increase our ability to fill orders at our current pace and grow at the same time. We have been selling these plates in our kits for a while with great success, so we are trying this special package as a R&D project based on client request. CTK- # 6- Basic Refill Kit, 100-125 test 25-TLC plates 4-5 test per plate (100-125 test) Fluid – Enough for 125 extraction and developing fluid tests. For shopping click here: https://thctestkits.com/store/Refill-Kit-6-Just-the-Basics-100-125-test-p320626619