Below you can find the The rolling element types of these friction-reducing machine parts come in 2 varieties roller & ball Jeopardy Words Answer. The answer to The rolling element types of these friction-reducing machine parts come in 2 varieties roller & ball has 8 letters. This clue belongs to the Friction category and is part of Jeopardy Word Level 1610. If you scroll near the bottom you will find other clues and answers part of level 1610