We are offering these new Professional Series Female 1/4" Mono TS (Tip / Sleeve) Panel Jacks by GLS Audio. They are full metal construction and you will notice that they have the high quality Fiberglass Insulators (not the cheap plastic insulators). These aren't your typical flimsy generic plastic jacks like other people sell. Sure, the GENERIC 1/4" jacks may be a LITTLE cheaper in price, but they are a lot cheaper in quality. Who wants a cheap jack that will break in no time? The GLS Audio 1/4" jacks are very Heavy Duty and comparable to Switchcraft #11 and Neutrik.