NextStone 6NPTB1 Random Rock Indoor/Outdoor Siding Panel 4-Pack, Tri-Buff Easy installation. Light weight panels can be installed within minutes with no formal training. Cost effective alternative to cast or real stone Realistic. Most people need to touch it before they can believe it's not real rock. Durable and energy saving. Adds an extra layer of insulation. Versatile. Can be applied inside or outside, at your home or office.