Size       Length          Test
0#         15mm          14kg
1#         16mm          19kg 
2#         18mm          23kg
3#         20mm          33kg
4#         24mm          47kg
5#         25mm          61kg
6#         30mm          76kg
7#         33mm          95kg

Package Include:  50/100pcs
Material: Copper + Stainless Steel
Features: Great pulling force. Built-in ball, high-speed rotation.
Color: white/black sent randomly.

Note:
Please allow 2%-3% error due to manual measurement. Thanks for your understanding.
The color may be slightly different from the real one due to the light.