Is this net strong enough to stop a child falling from a balcony?

It is a barrier for gaps and rails, not a certified fall-arrest product. Treat it as a visual and physical deterrent and keep it tight and well anchored, and do not rely on it as the only guard on a high balcony.

What size are the mesh openings?

The description gives a uniform mesh of about 1.6 inches across with cord about 0.16 inches thick. That is small enough to stop most balls and keep small pets from slipping through.

Knotless netting can be cut, but cut edges unravel unless you bind or melt them. For odd shapes, ask about the custom sizing the seller offers instead of trimming.

What is included with the net?

The net comes with excess corner rope and cable ties. There are no hooks, turnbuckles, or wall anchors, so plan on buying fixings suited to your railing or wall.

Will it hold up outdoors?

Polyester handles sun and rain better than natural fiber, but no UV rating is stated. Expect some fading and weakening over seasons in direct sun, and inspect it periodically.

Can it be used as a batting net?

Yes, it works as a backstop to contain stray balls for practice. It is not a commercial cage net, so keep hitters at a reasonable distance and check for wear.