1. Professional design conforms to ergonomics, avoids arm hanging in the air, relieves shoulder fatigue, no matter how tired you are at work, you must learn to of yourself 2. The punch-free design does not hurt the tabletop and can be directly clamped to the edge of the table. The thickness of the tabletop is Less than 8CM 3. Rounded corner design to prevent collision damage 4. Storable design, easy to fold and store without taking up space 5. Double clips + double brackets fixed support is stable and firm, strong support, safe to use Type: table mat Single-sided double-sided: single-sided Colour:black Material:wooden Size: 30 x 20 x 9cm Package Contents: 1 x armrest bracket 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.