5 four-arm and 6 five arm Star Connectors are required to make the Icosa-Dome.
Bolt/washer/nut on each tube end is used for attaching struts such as pvc pipe.
These Star Connectors are made from 3/4" conduit. Wood struts are ~3/4" x 3/4" with ends rounded using a router, with a temporary pressure fit connection for demonstration of this dome building method.