This is a sub-set of the standard United Kingdom Proof Set of the year, including some of the commemorative coins issued throughout the year, but not the regular circulating denominations.
The 2018 set includes the Saint George £5 (crown) commemorative celebrating the fifth birthday of Prince George, plus three commemorative £2 coins: Frankenstein, RAF Centenary (the Badge) and World War 1 Armistice; these coins were only issued in the year's sets and not released into general circulation. Also included is the Representation of the People Act 50 pence.
The coins are struck in Proof FDC grade with frosted finish. The set also contains an oblong Royal Mint medal.