The Black Eagle Deep Impact Nock Collars are designed to add crucial protection to the nock end of your arrows, reducing damage from rear impacts. Made from durable aluminum, these lightweight collars are built for long-lasting performance and are easy to install or remove. Weighing just 2.6 grains each, the green Deep Impact collars offer a perfect fit for 300 spine shafts and are a reliable, affordable upgrade for any archer looking to maximize arrow lifespan and consistency.