This Luster Leaf product is a light duty soft rubber twist ties with wire center. The spool is 16 feet in length and is a really cool new way to tie up and support your plants. This twist tie is a lot stronger and less damaging than standard twist ties with twistems. It is also twistable and retains its shape due to its wire center. It is light duty for thin stemmed plants like clematis vine, morning glory and etc.