According to the late Pierre Sprey of Mapleshade risers need to raise the cable 12" high above poly carpets to avoid the static electricity that is the reason to use cable risers. He also maintained that you can't use plastic as a material for the risers, his were all wood. I bought a bag of 100 wooden shish ka bob skewers, and had a bag of rubber bands. Tie three skewers together with twisted rubber bands a couple inches below the top of the blunt end, pointy end down, spread into a tripod, instant cable risers for about $2.98 per 33 of them that according to a former audio tweaking expert are better than what you can purchase. I'd post a pic of I could remember how on this forum, embarrassing.