25. Inventories

Types of inventories 31 December 2012 31 December 2011
Set-top boxes and disc drives – merchandise 45,862 43,965
Set-top boxes and disc drives – finished goods 32,805 68,736
Digital Video Broadcasting – Terrestrial units – merchandise 3,034 -
Digital Video Broadcasting – Terrestrial units – finished goods 17,485 -
SMART and SIM cards 4,454 6,921
Telephones and modems 20,432 21,170
Antennas and converters 3,479 6,134
Materials used in production of reception equipment 26,694 21,047
Other inventories 16,072 14,725
Total gross book value 170,317 182,698
Write-down of inventories (8,343) (4,571)
Total net book value 161,974 178,127

Other inventories comprise primarily of raw materials used in the production of set-top boxes.

Write-downs of inventories 31 December 2012 31 December 2011
Opening balance 4,571 5,349
Increase 6,272 1,211
Utilisation (1,915) -
Decrease (585) (1,989)
Closing balance 8,343 4,571