Simplify the following text for a Grade 5 native English-speaking person.
Original: Ice cubes are also produced commercially and sold in bulk ; these ice cubes , despite their name , are often cylindrical , and may have holes through the center . An interesting characteristic of commercially made ice cubes is that they are completely clear , lacking the clouding found in the center of domestically made ice cubes .
Simplified: Ice cubes are also made commercially and sold in big amounts .