15.5 INNOVATIVE DESIGN This lightweight innovative design measures 15.5 x 15.5 and features four ground stakes that attach to the bottom of each stepping stone. USES Perfect for outdoor walkways, garden pathways, grassy areas, muddy areas, sandy areas, and can be a wonderful addition to any home or garden. MADE OF RESIN PLASTIC Both the stepping stones and ground stakes are made of Resin Plastic. Resin is a more durable type of plastic that is made for outdoor use. INSTALLATION Simply click all four ground stakes into the bottom of each stepping stone and then push down into the ground. USA BASED COMPANY We are a USAbased company with a USAbased team and we proudly stand behind this product.