Feature:
Niti Closed Coil Spring (10pcs/bag)
Easy to hook on orthodontic accessories.
Offers the same shape memory benefits of superelastic Ni-Ti springs, with the added benefit of reduced inventories. 
Designed for applying the precise force required for every situation. As these springs are extended (close wound), forces are gradually increased, allowing a specific force to be generated at a given amount of extension
Diameter: 0.010 inches / 0.012 inches/ 0.014 inches; Length: 6mm / 9mm / 12mm
Niti Open Coil Spring (2pcs/bag)
Nickel Titanium open coil (compression), 
Springs designed to gradually increase in force as the spring is compressed, 
Generating the precise, consistent, gentle force without taking a permanent set. 
The package contains 2pcs of springs, each spring is 7"(180mm) long.
Diameter: 0.010 / 0.012 inches

Model:
Open Spring 010 180mm
Open Spring 012 180mm
Closed Spring with eyelets 010 6mm
Closed Spring with Eyelets 010 9mm
Closed Spring with Eyelets 010 12mm
Closed Spring with Eyelets 012 6mm
Closed Spring with Eyelets 012 12mm

FDA Statement:
The sale of this item may be subject to regulation by the U.S. Food and Drug Administration and state and local regulatory agencies. If so, do not bid on this item unless you are an authorized purchaser. If the item is subject to FDA regulation, I will verify your status as an authorized purchaser of this item before shipping of the item.