The Alloy 3.0 Rollers have approximately 40 more resistance compared to the 4.5 rollers, offering the best combination of resistance, cost, and portability. It was Previously called DynoLyte rollers. The Challenger is like the Alloy 3.0's, but with Poly end caps for a more economical option. It was previously called PolyLyte rollers. The drums measure 3.0 x 15 Purchase a Kreitler Universal Frame fo
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