This is a very interesting concept but we like it very much. This is a unique design that looks like the 14500 Bagua mechanical mod but ours will accept a 18350 or a 18650 battery. This mod is shipped in the 18350 mode but we are going to add a 18650 tubes with the order as well.
All brass connections on the top and bottom cap. See picture of the all copper version and it displays the contacts for the stainless and polished stainless steel.
1- Bagua 18350
1- 18650 Tube