"A dice tower is an object used by gamers to roll dice fairly. Dice are dropped into the top of the tower, and bounce off of various hidden platforms inside it before emerging from the front. Dice towers eliminate some methods of cheating which may be performed when rolling dice by hand. There are many forms of towers and they vary in construction and design." 
"The dice are dropped into the top of the tower and bounce off of several interior ramps before emerging from an opening at the base of the tower. Some dice towers include a walled off area for the dice to land in so that they are not scattered across the table."
Rusted Friend Dice Tower
Wide Mouth Dice Tower – Rusted Friend - http://rustedfriend.com/product/wide-mouth-dice-tower/
Wide Mouth Dice Tower by RustedFriend on Etsy ($40) - https://www.etsy.com/listing/190252375/wide-mouth-dice-tower
Rusted Friend – Gaming Supplies & Other Wonderments - http://rustedfriend.com/
Rusted Friend - Facebook - https://www.facebook.com/rustedfriend