Luminox replacement band for the Luminox 3900 series, 23mm size. Velcro and nylon are less likely to get in the way during work, and the Velcro closure makes it easy to put on and take off. - Brand: Luminox - Model: 3900 - Color: Black - Size: 23mm - Replacement Band: Genuine Purchased last month on Rakuten, unopened and never used. I am selling it because I don't need it. It will be shipped via Nekopos. Thank you. Thank you for looking.