The Monsters Party Musical Mobile soothes your baby to sleep with Brahms' Lullaby. It encourages visual, auditory and motor development. It attaches to standard size cribs and assembly instructions are included. The fabrics are 100% polyester, exclusive of trimming. Care instructions: spot clean only with a soft cloth dampened in cold water with mild soap, and line dry. Do NOT machine wash, bleach, tumble dry or iron.