This vertical loop is 7 mm high and is made on the arch wire, Generally located between the canine and the lateral
incisor, • Principle 1. This loop must be opened to be active, so it does not comply with this principle.
• Principle 2.
This is a vertical loop that closes spaces well, but it lacks a horizontal element, so it has
no vertical control.
• Principle 3.
This loop has a short wire length, so it can exert intense force .