These snap buttons can be attached by hand without using needles, thread, or tools. They are lightweight, rust-resistant, and made of plastic, making them gentle on those with metal allergies. The thickness of the fabric that can be attached is approximately 0.3 to 1.4mm when compressed (1 layer of sheeting to 2 layers of No. 8 canvas). I am selling these because I ordered the wrong size. There are 8 sets, but the inner bag has been opened, so please purchase only if you don't mind. - Size: 13mm - Quantity: 8 pieces - Material: Plastic - Color: Off-white - OEKO-TEX Certification: STANDARD 100 - Made in Japan *Anonymous shipping