This NBR rubber watch band with a curved solid end piece perfectly fits both Seiko MM200 and Seiko Mini turtle, such as Seiko Baby Marinemasters : SBDC061, SPB077, SBDC063, SPB079, and Seiko Mini Turtles: SRPC35K1, SRPC37K1, SRPC39K1, SRPC41K1 models. NBR rubber has superior strength and more resistant than natural rubber to oils and acids. Material has met the RoHS requirements and rarely causes severe allergic reactions. Accompany with a well-built stainless steel buckle and a featured big keeper. This item also includes one pair of custom made 1.78mm spring bars for easy but secure installation. NBR rubber watch band is a good choice of Seiko replacement watch band for your both Seiko MM200 and Seiko Mini turtle.