Adjustable - Eight heights can be freely adjusted from 5.5inch to 7.0inch. You can straighten your waist and relieve cervical and neck fatigue, feel comfortable to work. Durable - Made of lightweight ABS with non-slip rubber surface pads to keep laptop in place, strong and reliable, not easy to fade. Compatible with all laptops 10-15.6, durable enough to support up to 44 lbs (20kg).