These materials can be suspended by wrapping them in poly(arylene-ethylene) in a method that affords a relatively consistent pitch length. These materials can be oxidized to create “peapods,” which can then be annealed to create a different type of these materials. These materials are described by 2D vectors (15[1])(n, m) (15[3])(“n-comma-m”) that count units (-5[1])on a lattice; (15[1]-5[1])if 2n plus m is a multiple of three, (-5[1])then these materials are metallic. These materials were first synthesized by (-5[1])Iijima (“ee-ee-JEE-mah”) using the (*) arc-discharge method and come in (10[1])chiral, zigzag, and (10[1])armchair (10[4])forms. (10[5])Multi-walled (10[2])examples (10[1])of these (10[1])structures (-5[2])are comprised of nested single-walled versions (10[1])of them, (10[2])which can (10[1])act as extremely strong fibers. (10[3])For 10 (10[1])points, name these carbon allotropes (-5[1])with a (10[1])cylindrical (10[3])structure (10[4])resembling (10[2])a rolled-up sheet (10[1])of graphene. (10[2])■END■ (10[4]0[1])