Mulch, bark and pebble glue/adhesive. 32 Ounce concentrate covers 200 sq. feet. Go to amazon.com Related posts Top 14 best mulch lock concentrate: Which is the best one in 2022? FeatureSets mulch, bark or pebbles in place so wind water or blower will not disturb area. DescriptionSets mulch, bark and pebbles in place so wind water or blower will not disturb area. Protects from fading and dries clear.