Use the MP-106 Ergonomic Monitor Riser Block to reduce muscle fatigue and promote better seating posture. Heavy-duty, stackable riser raises the computer monitor in 1-1\/4" (3.2cm) increments to an ergonomically comfortable height. Add multiple blocks (not included) to suit your needs. Each TAA-compliant, high-impact plastic block supports monitors weighing up to 77 lb. (35 kg). Block platform measures 12" x 12".