Pine Ridge Nitro Peep Sight .25 -Inches- Nitro peep sights are made from high-impact resin. The resin will ensure years of durability without the heavy weight of aluminum. The colored premium silicone peep tubing will match the color of the Nitro Peep. Not only does it look good but it will self-align so the peep is always straight. .25 inchesSilicone TubingHigh Impact resinMade in the USA