Seat planks are 10 in. wide with a ribbed no-slip surface * Anodized aluminum planks keeps aluminum from rubbing off on your clothing * Comes with Safety End Caps-No sharp edges to snag clothing or skin * Frames are constructed of heavy duty commercial grade 2-3/8 in. O.D. galvanized steel * Indoor or Outdoor use - All frames are pre-drilled to be converted to indoor use