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The sucker rod centralizers are used to protect sucker rod to reduce wearing.
2.1. Plastic: UHMWPE (Ultra High Molecular Weight Polyethylene)
2.2. Rubber: Nitrile
2.3. Nylon: Nylon 6/6
2.4.. 42CrMo
3.1. Pure plastic
3.2. Steel frame, rubber inside and outside
3.3. Nylon6/6 roller and alloy steel body