The Type 90 Ship-to-Ship Missile (90式艦対艦誘導弾, SSM-1B) is a ship-launched anti-ship missile developed by Japan's Mitsubishi Heavy Industries that entered service in 1990. It is a naval version of the truck-launched Type 88 (SSM-1) missile, which in turn was developed from the air-launched Type 80 (ASM-1) missile. The Japan Maritime Self-Defense Force bought 384 of the missiles which were fitted to their Murasame, Takanami, Atago, Akizuki, and Asahi classes of destroyers, as well as Hayabusa-class fast-attack missile boats. With a range of 150 km (81 nmi), high subsonic speed and 260 kg (570 lb) warhead, the Type 90 is similar to the US Harpoon missile block 1C RGM-84D variant. But Harpoon is ditched in favor of the indigenous Type 90 starting with the 9 Murasame-class destroyers with the lead ship launched in 1994 and inducted in 1996.