Each crystal is individually packaged with a description card and detailed instructions on how to program and cleanse your stones. 

Medium = 3/4 inch to 1 inch long, by 1/2 inch to 1 inch wide.

Large = 1 & 1/8 inch to 1 & 1/4 inch long, by 3/4 inch to 1 inch wide.

About Snowflake Obsidian:
Snowflake Obsidian sharpens your external and internal vision.  It shows the contrast of life: black symbolizes mastery over the physical plane and white symbolizes the purity inherent in us all. 

Obsidian symbolizes entrance to the subconscious self and is associated with the inner mysteries of the Goddess.  It helps you to accept higher vibrations and grounds your spiritual energy into the physical plane. It also helps to clear away the cobwebs of your mind, reduces stress, and helps bring an understanding of silence.

Obsidian is also a very protective stone.  It absorbs and disperses negativity and helps prevent emotional draining by others.  Because of its protectiveness, Obsidian is a good stone for those who are soft-hearted and gentle, and will help guard you from abuse. 

Physically, this stone is known to  cleanse toxins from the liver, and  so it is a good stone for those exposed to environmental pollutants.  Obsidian is also beneficial to the stomach and intestines.