1. Professional design conforms to ergonomics, avoids hanging the arm in the air, relieves shoulder fatigue, no matter how tired you are at work, you must learn to take care of yourself 2. The punch-free design does not damage the tabletop and can be clamped directly onto the edge of the table. The tabletop thickness is less than 8 cm 3. Rounded corner design to prevent collision damage 4. Storable design, easy to fold and store without taking up space 5. Double clamps + double brackets firm support is stable and firm, strong support, safe to use Type: desk mat Single-sided double-sided: single-sided Color: black Material: wood Size: 30 x 20 x 9 cm 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 to differ slightly from the real one. The allowed measurement error is +/- 1-3 cm.