Sashiko Black Leather Thimble. This type of sashiko thimble is worn on the inside of the middle finger with the pad area down on towards the palm. It is used to help push the needle through the folds of fabric and which relieves stress to fingers and hand. A great thimble to try if you have never used one before. This thimble will fit most fingers by adjusting the length of the elastic cord. The soft leather will continue to soften over time.