Even bird netting as tough as ours gets holes in it - the good thing is that with knotted netting the rip never goes further than the next mesh. This characteristic makes it easy to repair. This repair kit contains a 500gram spool of 6 ply twine - the same twine that's used in the construction of the bird netting, and a netting needle. Netting needles make repairs much simpler and saves you from possible snarls and tangles.