The 167 Cylinder series diameter 160, 200, 250 and 320mm will be faced out at the end of 2015. It will be replaced by ITS cylinders.
There are some material and dimensional differences and some versions, which ITS will not have.You should switch to ITS as soon as possible as the materials and prices for the 167 series will increase over the next years.
Enclosed presentation summarizing the most important points.