Revelation 9:17

17 And thus I saw the horses in the vision: those who sat on them had breastplates of fiery red, hyacinth blue, and sulfur yellow; and the heads of the horses were like the heads of lions; and out of their mouths came fire, smoke, and brimstone.

A. The description of the horses and riders are similar to the fifth trumpet.

B. The riders have breastplates of fire. They are indestructible.

C. The heads of the horses are like lions. They are able to devour and destroy. They are breathing fire, smoke and brimstone. These are all terms used later in Revelation to describe hell, the place of eternal punishment for Satan and his angels.