This is a rear sprocket made of steel, sized at 41 teeth, and designed for a 525 chain pitch. According to product listings: “41 Teeth, Rear Steel Sprocket Suit 525 Pitch Chain. Precision machined for enhanced power delivery and efficiency.
It is likely used as a direct-replacement or upgrade sprocket for motorcycles that run a 525 drive chain and require 41T at the rear. Changing sprockets like this modifies drive ratio — increasing or decreasing revs, acceleration or top speed depending on the rest of the sprocket train.
