This is a 30cm Dynex Runner from Black Diamond. It's a sling made of lightweight and high-strength Dyneema® material, suitable for a wide range of uses, such as building anchors and extending quickdraws. It absorbs less water than nylon and is also resistant to UV rays and abrasion, making it particularly useful for alpine climbing and multi-pitch routes. ⚠️【Important Notes & Disclaimer】 Climbing equipment is life-critical gear. Use of used climbing gear is entirely at your own risk. Dyneema material can be affected by UV rays and aging, and strength degradation that cannot be visually assessed may occur.