As already noted, they are not shielded. However, the braided design used by Kimber and HomeGrownAudio tends to reduce problems from RFI, etc. I have the Silver Lace cable between my preamp and power amp, and Silver Solution interconnect on all of my components. The equipment is in a large entertainment center, next to a 32" direct view TV, and I have not noted any particular problems due to lack of shielding.
