All items are genuine Tamiya products. All items are used, so please understand their condition before purchasing. 95231 2-Stage Aluminum Roller Set 13-12mm (Black) 95499 Lightweight 13mm All-Aluminum Bearing Rollers (Black) 95314 Slim Mass Damper Set [Condition] The aluminum rollers have been used, so the paint is chipped where they hit the track. There are also small scratches on the rollers from going off-track. The 13mm rollers have had their internal pressure adjusted, and two of them are slightly loose. Please use Loctite or similar. The mass dampers have no noticeable scratches or paint chipping.