H&R (R25100300) 2.5" ID Race Spring 2.5 inch inner diameter Race Spring Free Length: 10 inch; Load at Block (lbs): 1902; Rate (lbs/in): 300; Block Height: 3.66 inch; Weight (lbs): 3.18 Sold individually Crafted from special lightweight (hf) 54SiCr6 spring steel 100 percent made in Germany