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This set of connectors will make a Tetrahedron when used with milk drinking straws. (Not supplied). The resulting Model is surprisingly strong.
Tips for Assembly
You want standard .13" diameter milk straws, I like the ones made by Carousel, Burlington, Ontario but any standard milk straws will do. Note that with the switch to paper straws these may not be easy to find anymore.
Cut them to shorter lengths with sharp scissors
Straws vary in a box, throw away ones that are too tight, or use a bar of soap to lubricate the connector