Maximum circumference9.1 tenths m
1.6 hundredthsLeaning Towers of Pisa
1.38Clarinet lengths
3.97Wine glass heights
The world's least useful encyclopedia

Photo from Wikimedia Commons
The polished granite disc slid across Olympic ice/Sports
Curling stones are made from two specific types of granite: Ailsa Craig Common Green for the body and Blue Hone for the striking band. Each stone must meet strict weight and dimensional specifications set by the World Curling Federation. The concave running surface reduces friction on the ice.