The spines are usually hollow and cylindrical. Shafts are usually made of hollow metal. The stems are erect, hollow, and grooved. Angklung consists of a frame upon which hang several different lengths of hollow bamboo. The key to the effectiveness of the hollow charge is its diameter. The dialyzer is composed of thousands of tiny hollow synthetic fibers. Colonies may form filaments, sheets, or even hollow spheres. Rotational molding excels at producing hollow parts. New alloy wheels with hollow spokes were standard. The tongue is long, hollow and extremely flexible. Sometimes, carpenter ants hollow out sections of trees. He defeats Merlina, destroying the Dark Hollow. Bigger breasts are easier to push together to accent the hollow between them. This influenced some early Hollow Earth proponents. The quirky townspeople of Stars Hollow are a constant presence.