![Fiber bobbin Fiber bobbin](https://extreema.extreemasoftslings.com/wp-content/uploads/2023/03/Fiber-bobbin-1-e1679480559611.jpg)
Core
The core of every Extreema® round sling is made exclusively of 100% high-performance fibers.
![DSC00197 PHOTOSHOP DSC00197 PHOTOSHOP](https://extreema.extreemasoftslings.com/wp-content/uploads/2023/03/DSC00197-PHOTOSHOP-scaled-e1679480329534.jpg)
Signal Sleeve
Signal sleeves indicate sling damage, allowing safe use of the core with jacket repair or replacement.
![DSC00519 PHOTOSHOP DSC00519 PHOTOSHOP](https://extreema.extreemasoftslings.com/wp-content/uploads/2023/03/DSC00519-PHOTOSHOP-scaled-e1679480319891.jpg)
Jacket
A round sling jacket keeps core yarn strands together but does not provide complete protection for the core material.