It sounds like you’re referring to Daniel’s Spawn Sac Netting in a 3×3 squares configuration, sold in packs of 50.

Daniel's Spawn Sac Netting - 3 x 3 Squares - Packs of 50

Possible Interpretations:
1. Mushroom Cultivation (Mycology) – Spawn sac netting is often used in mushroom farming to hold substrate (like grain spawn) while allowing airflow and preventing contamination. A 3×3 squares pattern may refer to the mesh size or dimensions.
2. Fishing or Aquaculture – If related to fishing, it could be a type of netting for holding bait or small aquatic organisms.

Key Details to Confirm:
– Material: Is it plastic, nylon, or another type of mesh?
– Mesh Size: Are the 3×3 squares measured in inches, millimeters, or another unit?
– Purpose: Is this for mushroom growing, fishing, or another use?

Where to Find/Buy:
If you’re looking to purchase this product, check:
– Mycology supply stores (e.g., North Spore, Mushroom Media Online)
– Aquaculture or fishing suppliers
– Amazon, eBay, or specialty agricultural retailers

Would you like help finding a specific supplier or more details on how to use this netting? Let me know!