The main feature of this spool is that the unroll is made by the outside and one coil with another can link. With this form of fast-forward, you shouldn´t need to stop manufacturing machine to change the spool. This presentation is widely used for machines with a rapid consumption of cord and quantities. Support tube spools.
This way you shouldn´t need to stop the manufacturing machine to change the spool. 3.000, 5.000 or 6.000 meters spool. This spool is widely used for machines with a big production capacity.