This is for a set of dual valve springs (a total of 4 separate springs). Approximately 36.3lbs at .880" and 40lbs at .850" installed height. Used on extremely modified high HP high revving 196cc-225cc small block honda clone engines such as the Tillotson 225. Stainless steel valves and billet or titanium retainers are required. Valve spring pockets may need to be modified.