This is a set of replacement suspension plate ball joints for the Thunder Tiger EB4 S3 buggy. The new S3 buggy uses these unique ball joints to hold the suspension pins in place to completely avoid the need for E-clips, but these parts will wear out over time and they are easy to lose. So it is a good idea to keep a set of these in your pit box. Part Compatibility: Thunder Tiger EB4 S3 Thunder Tiger ST-1