25 g royal mail

A classic!

"25g" is a reference to the weight of a letter in grams, and "Royal Mail" is the postal service of the United Kingdom.

In the UK, Royal Mail has a specific weight range for letters, which is:

• 1st class letters: up to 100g
• 2nd class letters: up to 100g

So, a 25g letter is a very light letter, and it would likely be sent as a 1st class letter.