This prevents the breast of getting greasy and sticky.
They are treated with a very special glue, and therefore can be worn with, or without bra. The adhesive is really strong enough to keep them against your chest. When you think they should be cleaned, you can wash them with mild soap and warm water, and let them dry propperly. After that the adhesive re-activates itself, and this works for a lot of times.
Weight p. pair is 600g/1,3lbs. – each breast 300g
Length 7,1″/18cm Width 5,5″/14cm, height 2,35″/6cm based on the longest and highest place in each case.