How to manufacture simple molds?

[Christine]

Trying to find out how you manufacture simple silicon molds like these earplug replacements, anyone know how? https://ae01.alicdn.com/kf/HTB1VElnKVXXXXXFXFXXq6xXFXXX2/116392936/HTB1VElnKVXXXXXFXFXXq6xXFXXX2.jpg – by hq overview Fount4inhead – –