Photo one is what is being shipped. It is gold aluminum anodized and machined. This listing is for a gold colored gear. The weights and studies shown in other photos  are using a gray colored gear. T Study the above photos, no 2 is 10 oz and no 4 photo is steel and weighs 24 oz

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Light weight space age metal is worth it, built tough to last too. This is a 30 tooth x 50 mm split gear.