Great for greenhouse and tunnel grown tomatoes! These handy plant hangers are designed to be hung over of your crops with a horizontal support wire. Bobbin Hangers are great for supporting tomatoes, cucumbers and other vining crops in greenhouse production. Bobbin hangers are wound with 30 feet of white twine and have two slots to lock in the twine to prevent slippage. At the end of the season, the twine can be easily stripped from the bobbins. Bobbins can be rewound quickly. Due to the U.V. stabilizer, the bobbins can be used for several years.