Approximately 3/4" in diameter Rose Gold plated base metal Vintage wind-up watch movements Due to the vintage nature of this item, watch movements may not function Bullet back closure A true collectors piece. Actual movements are taken from wind-up watches of the early to mid 20th Century and really turn. Featuring gears, levers and jewels, Ox & Bull Trading Co. Rose Gold Watch Movement Cufflinks allow you to wear engineering at its finest.