Osmocote Exact Mini has been especially developed for applications in small substrate volumes. It is therfore ideal for pots smaller than 8cm in diameter like plugs and trays with small compartments. The granules are so small that an optimum distribution of the nutrients in the substrate is guaranteed and can be achieved even in volumes starting at 20ml.

Osmocote Exact Mini is available in 3-4M:

Osmocote Exact Mini 3-4M
16+8+11+2MgO+TE