What make's the ring's of Saturn?

Answer 1

The rings of Saturn are composed of countless thousands of particles of ice and rock, roughly ranging from the size of a truck to fine dust particles.

Concerning the source of this ice and rock: Current consensus of planetary science is that these particle rings are the remains of a moon that was tidally destroyed by the considerable force of Saturn's gravity.

Additional Information:

It also seems likely that within 300,000 years or so, existing ring particles will all have been captured by Saturn's gravity, becoming part of the planet.

Assuming that Saturn finds no more orbiting fodder to grind during this process of assimilation, the familiar Saturn we see today will no longer be associated with these particle rings. It will simply be a gas giant like it's much larger neighbor Jupiter.

Answer 2

The Rings of Saturn are mostly water ice (99.9%) with a small amount of debris, that produces the colours.