Check the listing for details. MRP S4 Replacement Backplate - ISCG-05 Black Open Box. Color: Black, Condition: New other (see details). Listed at 40.00 USD. *This product has been opened and is found to be in new condition. Often open box items are great deals as they have never been used and only the packaging would show markings. It is sold as "non-returnable". Standard warranties still apply. So, you managed to bust a backplate on your MRP chain guide. We're pretty impressed, actually - it must've been one helluva hit. Lucky for you, one of the awesome things about MRP chain guides is that each part is completely replaceable, so you're not stuck shouldering the cost of an entire new unit. Available to fit nearly any frame, MRP's light alloy back plates can get you back out on the trail free of dropped chains.Replacement plate for S4 model chain guidesAvailable in BB, ISCG and ISCG-05 mounting optionsLightweight black anodized alloy