This Anchor Necklace on Leather is adjustable by slip knot one size fits all max opening is around 65/70cm. For size please refer to the measurements below
Anchor with lettering on it is 34mm*21mm
Plain Anchor is 31mm*25mm
these charms are not big (macro shots make objects look larger) and quite light, they should be worn at the base of the neck, if you wear it fully extended it might stay not put because the lightness of the charm. Leather is not waterproof.