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1. Introduction of sucker rod centralizerThe sucker rod centralizers are used to protect sucker rod to reduce wearing.2. Material2.1. Plastic: UHMWPE (Ultra High Molecular Weight Polyethylene)2.2. Rubber: Nitrile2.3. Nylon: Nylon 6/62.4.. 42CrMo3. Structure3.1. Pure plastic3.2. Steel frame, rubber i