PlumEasy Patterns Ground Walnut Shells (unscented) #PEP301 Ground walnut shells are a wonderful filling to use for pin cushions. The weight gives it a solid feeling which will not slide around on your table. The bag has 2 cups volume and will fill most pin cushions. The bag has a zip closure and is heavy clear plastic making it easy to use. Also use walnut shells for: bean bags, bags to microwave for warming sore muscles, sewing tube for ironing seams open.