This is the Yuba Deflopilator. This is a spring to prevent the wheel from flopping.

Vendor Item No: AC-SW01

Features:

• Keep your front wheel in check when using our dual kickstands by attaching the Deflopilator to your down tube
  
• This device doesnt change the handling of your bike appreciably while riding, unless it is set very tight.
  
• Installs easily
  
• Hardware included
  
• Works with Stand Together dual kickstand and Side Stand
  
• Included with Mundo Lux, Mundo Electric, Boda Boda, Kombi and Spicy Curry models

Shipping Weight & Dimensions:

• Shipping Length (L): 5.8"
• Shipping Width (W): 3"
• Shipping Height (H): 0.1"
• Shipping Weight: 0.5 lb