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Old version by GripperBot on 2026-09-16 20:50:37 compared to new version by GripperBot on 2026-09-17 14:53:52

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1# Powerball 1Powerball's **PowerGripper Metal Series**, sold by RPM Power, consists of fixed-resistance torsion-spring grippers with colored metal handles. It is distinct from the company's gyroscopic Powerball exercisers and adjustable PowerGripper products.[^1][^2]
2 2
3*This article is a stub.* 3## Models and identification
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5Gripperpedia is collecting reliable information about this gripper brand or model, including its manufacturer, production history, specifications, photographs, and contemporary sources.5RPM Power lists eight Metal Series strengths. Each uses a different handle color:[^1]
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7| Model label | Handle color |
8| --- | --- |
9| 50 lb | Pink |
10| 100 lb | Purple |
11| 150 lb | Blue |
12| 200 lb | Red |
13| 250 lb | Black |
14| 300 lb | Silver |
15| 350 lb | Gold |
16| 400 lb, “The Hulk” | Green |
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18The manufacturer describes stainless-steel springs and a diamond-pattern gripping surface. Its 400 model is described as slightly larger than the other models.[^1]
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20## Sets
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22The seven-piece set contains the 50 through 350 models and a display stand. The green 400 is a separate addition to the range, not one of those seven grippers.[^1][^2]
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24## Independent rating records
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26In March 2025, Matt Cannon published measurements collected when Cannon PowerWorks stocked Powerball box sets. His figures included a 300-model average of 144 lb RGC, with measured examples from 130 to 152 lb. The 400 averaged 196 lb, with examples from 176 to 209 lb.[^3]
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28These are historical measurements of sampled grippers, not guaranteed specifications for a newly purchased example. They also demonstrate that Powerball's advertised model numbers and RGC ratings are different scales. The original discussion preserves the complete measurements without requiring a duplicate ratings database here.[^3]
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30The same discussion contains an owner's observations of a seven-piece set, including measured handle spreads of approximately 67 to 71 mm. Those measurements describe that owner's set rather than a manufacturer tolerance.[^3]
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32[^1]: RPM Power, [Metal Grip Strengtheners](https://powerballs.rpmpower.com/product/powergripper-metal-series-50lbs-350lbs/), manufacturer model and color descriptions.
33[^2]: RPM Power, [Metal Grippers 50-350lb, seven-piece set](https://powerballs.rpmpower.com/product/powergripper-7-piece-set-50lb-350lb/).
34[^3]: Matt Cannon and mcalpine1986, [Power Gripper: Metal series grippers set](https://www.gripboard.com/topic/68047-power-gripper-metal-series-grippers-set/), The GripBoard, March 17, 2025.

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