Used to purchase Specter products, used them on purpose. However, it has been many years since I needed one of these kits so I settled on what I know, a brand that has been around for a while and has a long reputation for quality. I was very disappointed to find that quality is no longer the Specter's forte and I can no longer recommend them with confidence. However, the only defective part I could find out was each of the 5 sets in a perfectly sealed clamshell packaging that was never openedβ¦