This set includes :
1 JDG crafters ring mandrel 4-8.5
1 JDG crafters ring mandrel 9-13
Stainless steel or Delrin
Delrin mandrel should not be used for rough turning as they are made for glueing and finishing only, as delrin is a softer material that will wear down faster than metal, a black powder may come off the delrin mandrel when sanding.
These mandrels are consumables and should be replaced when worn out, show signs of extreme wear and/or broken, replacement screws are also available.
Always use appropriate PPE and Eye protection.