Glows in the dark, assisting with nighttime walking. ● Product Name: Door Knob-chan (for round knobs) ● Size: 4.5cm x 6.5cm (round knob) ● Material: Elastomer (feels like rubber) Please refrain from purchasing if you are concerned about minor dust or dirt. We cannot guarantee the quality. We inspect the product before shipping. Please note that we cannot accept returns or exchanges after shipping. We will use recycled materials for shipping. Thank you for your understanding.