Grodan mini block, MM 40/40, fits in item 102819, 4 x 4 cm, 1 strand of 15 pieces.

Miniblock
Grodan rock wool starting block, 4 x 4 cm, suitable for large-hole cultivation blocks (285A and 4060). Pack of 15. Can also be used directly as a cultivation block.

Growing plants on Grodan blocks is child's play, as the blocks fit perfectly together.
The Grodan Single Block System (SBS) and the AO propagation blocks fit into all available culture blocks (DM4G, DM6.5G, or item no. 4070). Please always select the correct hole size (27 or 40 mm). The culture blocks can then be placed either on mats, in other substrates, or directly into the cultivation system (e.g., ebb and flow table or NFT system).

150 strands/carton