Made of sturdy metal with no sharp edges, strong and safe. Easy to install, less than 10 minutes to install. Perfect for kitchens, bedrooms and any place you need to enjoy. Compatible for SONOS ONE SL size:148*144*88cm Material:metal colour:Black Package Contents: 1 * Wall mount bracket Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.