Professional Design - designed specifically for sheet music and used with sheet music stands, they hold sheet music easily and keep the sheet music or book flat, the pages can hold any thickness of sheet music and are easy to move when changing pages Transparent Acrylic - the sheet music book holder is made of clear, highly flexible acrylic with a scratch-free surface and smooth lines, making it easy to read the score without blocking any notes or text on the score erfect for Playing Outdoors - works great in windy conditions outdoors, it holds the pages in place to prevent flipping and the sheet music page holder makes you less nervous when playing on windy days Versatile Clips - The music book holders are a practical tool for composers and musicians, also suitable for cooking recipe, students's musical homework, pastors or priests sermons, professor lectures, etc. these clear page clips can be used to read a of books colour: transparent Material: Acrylic Size: about 6.5x4x30 cm Package Contents: 4 x Music clip Only the above package content, other products are not included. Note: Light reflection 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.