Product name: Zreephy New Design Professional Metal Sheet Music Phone Tablet Stand Holder For Digital Piano, Keyboard Instrument, Wind, Guitar, Ukulele, Violin Players, With a Phone Flexible Arm Holder & Tablet Flexible Arm Holder Model No.: MS01-SA The tray size: H 16" * W 11" (40.5cm * 28cm), and thickness of 1mm. The base size: L 12.9" * W 7.8" (32.7cm * 19.7cm), thickness of 7mm (with a sponge pad) Adjustable height: 35.8"~55" (91cm~140cm) What’s in the box? MS01-S sheet music stand *1 Pcs, Installation guide *1 Pcs, Phone Flexible Arm Holder *1 Pcs, Tablet Flexible Arm Holder *1 Pcs, Extension plate *1pcs. Features: ? Design of against the wall, it can be perfectly with keyboard instruments, effectively saving your space and easy to clean. ? Suitable for players of various instruments,such as keyboards, stringed instruments ,wind instruments,drums,etc. Whether you are standing or sitting, you can use it. ? Two brackets with screw holes on the back of the tray that can be used to attach other accessories,such as Music Stand Lights, Phone holders, Tablet Holders, etc. ? There are two mounting holes on both sides of the front lower part of the tray, which can be used to install accessories. The bent edge at the front to prevent the devices from falling off. ? The angle for the tray of the music stand can be freely adjusting within 0~90° to suit your play at the best angle.or to place a projector or a laptop. ? Easy to install, you can complete the installation of the music stand in just 3 simple steps.