Bits and Pieces - Round Riverstone Stepping Stones Set - Decorative Stones for Your Garden River Stone Stepping Stones are a unique and functional decoration for your yard or garden. This set of three circular mats is covered with smooth polished stones that are comfortable to walk on. Makes a great home decor gift for the lawn or garden. Crafted of polyresin for a durable, weather resistant finish. Each River Stepping Stone circular mat measures 12" in diameter.