From the Manufacturer:
"How fun it is to crawl through this "See-Me" Tunnel! Use it alone or join it with other tunnels for more crawling fun.
DURABLE: Nylon base with mesh on top. Structure is metal wire fully enclosed for safety and durability.
SIZE: 6 feet long by 19 inches in diameter.
STORAGE:Tunnel folds for easy storage and carrying.
SAFETY: Side mesh panels are for full visibility of child inside tunnel.
RECOMMENDED AGES: 18 months and up."
Photo from vendor.