Firecracker Ladders lend a level of difficulty that will test the skills of the fittest athlete. With 1-1/4" X 12" poplar wood rungs lashed to a single 3/4" combo rope down the center; this is quite a challenge. This type ladder has a steel thimble spliced at the top of the rope and a back-splice at the bottom. Choose 18" or 12" rung spacing.