Can anyone tell me why?

They come in rolls of 40 feet. If you want a 3 foot wide ring, it's 3 * 3.14 (PI). So you need about a 9 foot piece to make a 3 foot diameter ring. I started with 3 foot rings, but later added 2 foot diameter rings (2 * 3.14) = ~ 6 foot long piece.

The rolls usually come with plastic spikes as well to hammer into the ground and hold the mulch rings in place.

They are so worth it!
 
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