Little Pieces Jewelry - Basic Bangle Shapes, multiple options
Hand rolled polymer clay bangles. Light weight, durable and slightly flexible. Since each one is hand rolled they will all vary slightly making them all unique.
These have a circumference of around 7 3/4 and will fit most.
To know your size take a string and fold your thumb in as far as possible across your hand, then measure around the largest part. It should give you your size, then add about 1/2in to 1in for comfort.
Images show shapes and colors but not necessarily exact options available in stock.