The all new Holographic guides from American Tackle feature our trademarked super hard Holographic Titanium Nitride coating over Zirconia ring. The super hard Titanium Nitride Holographic finish changes color depending upon the angle you look at it—red, blue, green, gold, purple, pink or any color under the rainbow. Just imagine the thread possibilities. American Tackle Company’s new Zirconia (Zirconium Zr) guide rings offer the best all around value on the market today. This material has hardness and heat dissipation factors approaching that of silicon carbide. Zirconia provides a highly durable substance to withstand even the toughest of today’s fishing lines, at a much lower cost than silicon carbide