600010_00.png.png。Nike Air Jordan V 5 Low Golf Cleats Retro Fire Red CU4523-100 Men Size 9 Mismatch FSR PT Sample/EST Sample. This pair has one of each. FSR PT is Full Size Run Promotional Tester typically given to retailers, partners, influencers and athletes for promotion. EST is Early Sample Tester created for internal testing and evaluation of the design, materials and features, typically produced in a few sizes, most commonly men\'s size 9 and usually worn by Nike employees for internal wear testing. You will notice minor differences between the 2 shoes as one was an initial tester whereas the other was released to influencers and celebrities as a final, or near final design just prior to release.