What is IM6, IM7, IM8 graphite ratings?

Graphite Rods Difference - Fishing Rods, Reels, Line, and Knots - Bass Fishing Forums

im7 rod products for sale

im7 rod products for sale

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Quantum Graphite Fishing Rods & Poles for sale

Lew's American Hero Camo Speed Spin IM7 Combo AHC3066M-2 , 30% Off with Free S&H — CampSaver

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24, 30, 36 Ton, IM7-12, High Modulus-What Does it All Mean!???

Aventik 4pc Weight7/8,9foot MF Graphite Fly Rod Carbon Fiber Blank with Cordura Rod Tube(4Pcs wt7/8,9ft) : Sports & Outdoors

IM6, IM7, IM8??? - Fishing Rods, Reels, Line, and Knots - Bass Fishing Forums