• Easy-to-read color markings on the "funnel shaped insertion slot" for easy threading. The trunk thread insertion slot is blue, and the leader insertion slot is red.
• Adopting a "tilted hole" that extends 20 ° above to reduce leader entanglement and bring out tension
• "Side plane structure" where the Leader insertion slot comes to the front when picked with fingers
• Securing a wide range of compatible issues and strength