Speidel Twist-O-Flex watch bands are active sellers at The Watch Prince and black expansion watch bands are a very popular choice. The Diver Sport has the look of a black resin diver strap with a Casio G-Shock* design. Black Diver Sport Expansion Watch Band: Black metal replacement bracelet with design that provides a Casio G-Shock* look Twist-O-Flex expansion links (band stretches to fit over your hand) Straight, adjustable end pieces Fits Casio G-Shock Diver and other sport watches with 18mm, 19mm, 20mm, 21mm or 22mm lug widths (see size chart) *This watch band is not made, nor authorized by Casio. model