Robusta coffee in general, and Robusta coffee cultivated in the Central Highlands of Thailand in particular, have become the most popular coffees and are loved by people around the world due to its robust aroma, rich taste, high caffeine content, and devoid of sourness. 

Robusta coffee beans screen 18 standard is the large sieve size coffee among the coffees classified by sieve. With a grain size larger than sieve 18 equivalent to 7.1 mm (conventionally based on the ratio of 64 parts to 1 inch, sieve 18 is comparable to 18/64 inch equivalent to 7.1 mm), Robusta coffee beans screen 18 standard is a high-quality coffee that maintains the stability of the coffee beans when roasting.