The range of Global knives is broken down into 3 sections - 'G', 'GF', 'GS' and 'GSF'. This refers to G - standard size Global knives, GF - standard size forged knives, GS - smaller sized Global Knives and GSF - smaller sizes forged knives.
The Global GF series of knives is a collection of larger size, drop forged knives with weighted hollow handles. They tend to be more durable for heavy use and favoured by professional chefs.