Powerful Human motivational stones are made of natural minerals, glass, and stone.  Each piece is laser engraved with motivational words on the front and the powerful human double infinity on the back, they make the perfect gift for any occasion.  Currently we have 20 unique messages and symbols, please contact us directly or add a note with your word or symbol selection when placing your order. Your stone color will be a surprise.  Each stone is 1 3/4 X 1.5 in.