The hybrid strap is a continuation of the roll-up steel strap and the stretch steel strap. Together with the Graduate School Frankfurt, Cobra has developed a combination of these two types of strip steel.
The steel tape has variable surface tension so that some areas have unwinding effect, others have a roll-up effect. Making use of this combination of surface tensions, it is possible for example to develop roll-up rulers with a self-roll-up button at one end of the ruler.