Fiberglass rollers are great for helping to apply fiberglass fabrics and help to wet out projects by removing air. The design of the roller helps to push the fibres down and the resin and air through so that you end up with a stronger finished product.
Rollers are made from Aluminium and can be easily cleaned with acetone so long as the resin has not hardened.
The Bodi rollers are considered to be professional grade where they will be getting frequent use. Quick change heads are removable so you can clean easily and use the same handle for multiple head options.