The product featured is a high performance Baulking Synchro Ring Set which is used for the following gearbox types: MG Midget 1500, Triumph Spitfire 1500/1300, Marina 1700/1800, Dolomite 1850, Ital 1300/1800, TR7 4 Speed, GT6 Gearbox Types. This product is compatible with 3 Synchro and 4 Synchro gearbox units. The package content consists of 4x Baulking Synchro Ring. (Require 1 Baulking Synchro Ring for each gear). Please note we only use high quality branded bearings ensuring that our products are high in quality and performance.