Coghlan's Mini Stretch Cord
10 in / 25 cm stretches to 20 in / 50 cm
Here's what other sites are saying:
These 10" length cords are handy to bundle ski poles or fishing rods and ideal for dozens of other lightweight uses. Multi-strand rubber core features a weather-resistant outerwrap and coated, hardened-steel hooks. Each stretches to 20 inches. Comes in a package of four.