This Zeroo Time T4 The Archer Full Skeleton Tourbillon watch is powered by a manual movement. The 41mm by 48mm tonneau-shaped case is crafted of black steel with crystal glass sides. The yellow skeleton dial features a tourbillon function. It is protected by sapphire crystal. The yellow rubber strap has a deployant buckle. Water resistant to 30 meters. Limited production of 1,000 pieces.