We wanted the most precise rendition of detail possible for the seventeen pieces which compose the CO2 Heart Lasers so that the parts would fit together perfectly. Since these devices are used in operating rooms, we wanted all the resistance to chemicals and solvents that we could get. And, since they're moved from operating room to operating room repeatedly, they had to stand up to a lot of handling, scraping and abuse. We got – and still get – better forming than with other materials we might have used.