These are Stackable 3D Scanner Marker Towers for use with 3D scanners like the Creatlity Otter and Raptor, as well as many others. They're made up of a base, riser, and dodecahedron marker. They are designed to be able to be stacked in any configuration of risers and markers, and they can be used with standard size 10mm or 6mm reflective scanner marker decals. Like my other scanner markers, the base of these marker towers can be used with 8x3mm magnets so they can be stuck to whatever steel surface you need. 

Note: Although the base model is designed to be used with “8x3mm" magnets, I've found that 8x3mm magnets are usually around 8x2.65mm. Check the size of your magnets to be sure they're roughly that size before purchasing them. I've listed the exact model I used below. Also, I've designed these to hold the magnets without any glue by your mileage may vary. A small drop of CA glue should hold them just fine if needed. 

Parts used: 

-8x3mm magnet: [https://amzn.to/4ti1yWJ](https://amzn.to/4ti1yWJ)