DID - High Quality Solid Roller Chain - MADE IN JAPANNon O-Ring standard chain.STANDARD NON O-RING CHAINS ARE NOT SUITABLE FOR HIGH PERFORMANCE MOTORCYCLESNB: if your motorcycle came with an original O-Ring or X-Ring chain, DO NOT replace it with a STANDARD NON O-RING CHAIN. You must replace it with a sealed chain of equal or greater strength.Model No.: 415, 420; 428; 520; 525; 530 Fits: KTM 50 SX 2003-2011 50 SX MINI 2010