These pleasant little bags are made of cotton, 100% Food Grade, non toxic, soft, natural and safe, durable and reusable.
 
Size: 10*8 cm/3.93*3.14 inch. 
 
There is a drawstring on the top of tea filter bag, you pull the string to close the top, which then makes it  bunched at the top. Tea leaves will not leak out, leaving no mess in your cup!