This is the entire nut (berry) not just the shell.
Soapnuts are a natural alternative to the normal laundry powders and cleaning products available on the market. They are actually a berry from the Soap Berry Tree (Sapindus mukorossi), which grows in abundance in the Himalayas.
They have a natural soap (saponin), which is released when agitated in water. Soapnuts are environmentally friendly and free from harsh chemicals and can be used not only as a laundry detergent, but also a dishwasher detergent, body wash, shampoo, multi-purpose surface cleaner and pest deterrent. They are also cheap – averaging about 5 cents a wash as they can be reused a number of times! Soapnuts are also great for those who are allergic to the supermarket washing powders and cleaners.