Special teak logs have two uses: * Sell them to the Sawmill Operator, north-east of Varrock, Taverley, or Prifddinas for 1,300 coins. * Exchange two of them for a completely free conversion of teak logs in your inventory into teak planks. You can convert up to 27 teak logs into teak planks each trip (2 noted special logs and 27 teak logs in inventory). This values special teak logs at each (based on GE prices for teak planks).