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They nicely cover the soil around your young trees prevent the weed from growing beneath and protect your treesâ roots from damaging by the lawn mowers.8in 10.08 inches (H) x 0. Package Includes: 12 PCS Mulch Tree Rings (Others are NOT included) 12 Pcs Non-Woven Tree Mulch Ring Degradable Tree Protector Tree Weed Barrier Mat Black 5.