Causes. In ALS, the nerve cells that control the movement of your muscles gradually die, so your muscles progressively weaken and begin to waste away. ALS is inherited in 5 to 10 percent of cases. The other cases appear to occur randomly.
1 The smaller studio uprights usually weigh between 400 and 600 pounds. 2  The monstrous full vertical or large upright piano can weigh as much as half a ton.  A studio piano's center of gravity is also lower than a large upright's, as it is about 4 feet (1.2 m) tall as opposed to a large upright's roughly 5-foot height.
Grand pianos can weigh anywhere from 500 to 1200 lbs. Baby grand pianos are 4 foot 6 inches to 6 foot 6 inches long and they can weigh between 500 and 800 lbs. But longer grand pianos weigh much more and should always be moved by professionals because the piano dollies have about an 800 - 900 lb. weight restriction.