The application and operating environment, target quantity per year, and any material or tolerance requirements you already have. If you do not have a model yet, a description and a photo are enough to start.
Stainless Steel 316L, Stainless Steel 17-4 PH, Tool Steel M2, Titanium Ti-6Al-4V, and Inconel 625. Custom alloy development is available if your requirement falls outside that list.
From a first article through to 1,000,000 parts a year. There is no tooling, so the same process makes the prototype and the production run, and the price does not fall off a cliff at low volume.
We review what you send and come back with process fit, alloy, and what production would look like. There is no cost to find out.