I'm not sure how effective they actually are, hasn't Asus stopped putting them on its newer cards? Some people place the card inside a magnetically shielded bag like you gets with most computer equipment. The most interesting solution appears to be ERS paper. See here:http://www.head-fi.org/forums/f46/hotro ... 6k-226975/
thanks for the link. I don't want to risk damaging my own card. I'm not sure hwo effective they are, but at newegg and other vendors, asus xonar and new offerings from creative x-fi fatality use shielding.