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150 small starter cubes in a tray for growing from seeds and cuttings.
All rockwool cubes, blocks, slabs etc always come with a slighly alkali pH so prior to use if you want to achieve the best results you must pre-soak your rockwool.
Get a small bucket or container and fill it with water, adjust the pH of the water using pH down and a Ph test kit or digital meter so the pH is 5.2 to 5.5, then drop all the rockwool cubes you are going to use in and leave for 12 to 24 hrs. Your rockwool has a pH of 6.5 to 6.8 so by pre-soaking in the lower pH solution it will stabilize around 5.8 to 6.2 which is the desired level for hydroponic growing.
When re-wetting your cubes during the cutting process always make sure your solution has a pH in the range 5.8 to 6.2