Did not know about guitars.
Thing is people concentrate on the acetate as material that makes KEM great cards but ignore or maybe not familiar about the printing process that makes them so singular.
Ok, they bow but do not lose ink ... In that capacity they are top runner amongs other cards. This is because after card is printed it is coated with microgranules of similiar material.
The closest to replicate KEMs characteristics is Fourniers. Every Fournier (ok, not every but premium plastic ) is in fact 3 layers of material. Middle one is printed with ink that 2 outer layers are being applied to prevent losing ink.
General advice....
Do not bitch about KEMs but jus look for the best deal per dolar spent. "(not talking about
@Colquhoun in aby regard)"