The resistances in the higher range are mostly made of: 

Resistors of high value are made up of carbon.

• Carbon has approximate characteristics for resistance due to which carbon had been used in resistor construction for over a century.
• One of the main reasons is that resistors made out of carbon are regarded as highly reliable, that is, they don't fail often. They are also very effective at high energy levels.
• Carbon resistors can be found in two forms - carbon composition and carbon film.