This is our new version Aethertubes with reduced weight, increased durability, and no glue seams. These are manufactured from a single piece of extruded foam. This high-performance black cross-linked 1.75lb foam is light weight and durable. Comes pre-formed into a 24" x 2.5" tube with a half-inch hole, but is otherwise completely solid. To get the most out of this foam make sure and use it with a constant diameter half-inch core such as .505 kitespar. Use with a tapered core will lead to premature breakdown. Also be sure and apply an even, overlapping skin of tape to the entire exterior surface to prolong the life of the foam.