S ∙ L 1/2 ∙ inside band circumference is 52mm
M ∙ N 1/2 ∙ inside band circumference is 54mm
L ∙ P 1/2 ∙ inside band circumference is 56.5mm
“Tyger Tyger, burning bright,
In the forests of the night;
What immortal hand or eye,
Could frame thy fearful symmetry?”
William Blake