1. Stamping roller used to stamp the dough according to the pattern. Can you provides the reasons why stamping roller uses stainless steel for material selection in term of manufacturing processes. 2. Portable tray used to fill the cookies after completingbthe stamping process before transfer to the next process. Can you provides the reasons why portable tray uses stainless steel for material selection in terms of manufacturing processes 3. Sensor used to detect any physical abnormality that occurs in the system and produce a signal to notify the operator. Can you provides the reasons why sensor uses Fresnel lens, pyroelectric material for material selection