Cool Blue Hollow Olive Cool Blue Hollow Olive is 100% Lead-Free and safe for children and pets to play one. It's a perfect solution for private and public playgrounds, schools and kindergartens, households with multiple pets, animal hotels, and vet clinics. Dogs love to play outdoors on the lawn, but they also like to keep a company. With lush and luxurious artificial grass, kids and grownups can run and roll, enjoying life with their furry friends. The smooth, non-slippery, perfectly leveled surface of turf is safe and comfortable underfoot and under-paw; no mud, no mess, no brown, bare spots.