This strong, lightweight Sea to Summit Reflective Accessory Cord has many uses, such as guying out tarps or tents and hanging laundry at the campsite (or in your living room).. . Standard 3 mm diameter. Super bright and reflective for easy visibility. Hydrophobic polyester wont soak up water and add unnecessary weight. Tight weave resists tangling. Length: 16.5 ft. (5 m). Weighs only 0.9 oz. (26 g).