Hot stamping is the transfer of a coloured foil onto raised letters or logo that is moulded onto the part. This practice is widely used throughout the industry to promote products.
Here are just a few samples: -
"Customer Quotes"
'Thanks JSB, you proved we could get it delivered
ahead of schedule.'
'It has been a pleasure doing business with you, excellent service, thank you'
....the goods were of the highest quality , thank you' '