It is used in reaper-binder machines to tie sheaves of crops like wheat, oats, and barley.
Materials: Modern versions are often made from polypropylene for strength and UV resistance.
Key Features: It must be strong enough to withstand machine tension, smooth enough to pass through mechanisms, and hold a knot securely without slipping. Longtai versions are UV-treated and designed not to untie.

| Item | Typical Range |
|---|---|
| Material | 100% Polypropylene |
| Color | Blue, orange, white, green, yellow |
| Diameter | 1mm-5mm |
| Length | 500m-10,000m |
| Strength | 40kg-500kg+ |
| UV treatment | Optional |
| Packaging | Spool, ball, cone |