■ Product Size: Bead diameter approx. 6mm, approx. 450mm This is a necklace that simply slips over the head, made with only Ope-lon rubber. If you have terahertz and experience discomfort, dizziness, or other adverse effects after prolonged use, it is not terahertz and you should discontinue use. If a necklace is effective, I recommend a pillow pad, but if a necklace is not suitable due to work constraints, you can switch to a pillow pad. We also offer a set of two single-strand necklaces that you can assemble yourself. The photo is 55cm. 300 yen up for every 50mm.