17 new interlocking panels, 18" deep x 24"wide (partial box). Protect sidewalks, driveways, & patios from root damage - redirects roots away. the ones I've used have worked great, stopped a large tree from growing its roots under our paver sidewalk.
Here's an Amazon link with more info... hhttps://www.amazon.com/dp/B00BJWCIV2?ref_