Two images showing a single twisted S280W502 cable with the end stripped to reveal the shielding, insulation and filler layers and structure.
 

 
TypeClassWire Size (AWG)InsulationConductorShieldJacket
MaterialCoatingMaterialCoatingMaterial
1224PTFEHigh Strength Copper AlloySilverFlat Copper & Round CopperTinFEP
3422PTFEAnnealed CopperSilverFlat Copper & Round CopperTinFEP
4224PTFEHigh Strength Copper AlloySilverFlat Copper & Round CopperTinFEP
6224PTFEHigh Strength Copper AlloySilverFlat CopperTinFEP