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"\rShark belts are unlike conventional belts as they have grooves inside that make them more effective in creating movement on the movable parts such as the brush rollers. So if you think that the movable parts of you vacuum cleaners are not working effectively, then the belt fit shark might need to be replaced. 2PK Belts Fit Shark, NV350, HV400 &amp; NV500 Series Vacuums. Fits the following NV350 Models: NV350, NV351 &amp; NV352. Will not fit NV350 models that use the serpentine/grooved belt. Fits the following HV400 Models: HV300, HV301, HV302, HV305, HV308 &amp; HV310. Fits the following NV500 Models: NV500, NV501, NV502, NV503, NV505 &amp; NV500W. We recommend you change your belts every 3-6 months depending on usage. \r\r\r\rDesigned &amp; Engineered by Crucial Vacuum.\rEngineered &amp; Designed by Think Crucial\rDesigned to Fit NV350, HV400 &amp; NV500 Series\rDefinitely important for Allergy Sufferers!\rLong life and Durable Belts\r\r\r\r Please note the following important information about this product from Think Crucial: (i) it is a generic replacement, NOT a Shark\u00E5\u00A8 Original Equipment Manufacturer (OEM) product; (ii) because it is not a Shark\u00E5\u00A8 OEM product, it is not covered by any Shark\u00E5\u00A8 guarantee or warranty; (iii) use of this generic replacement may violate or void Shark\u00E5\u00A8 's guarantee or warranty - it is entirely your responsibility to check, and entirely your risk if you decide to use this product; (iv) we do not guarantee or warrant that this generic replacement is compatible with any product from Shark\u00E5\u00A8 any other provider. Please check your manufacturer's warranty with regard to the use of non-OEM parts. Think Crucial provides no warranty or guarantee with regard to the product or its compatibility with your Shark\u00E5\u00A8 product. The Shark\u00E5\u00A8 brand and all Shark\u00E5\u00A8 trademarks belong to Shark\u00E5\u00A8 or its affiliates, and are used here only to explain the compatibility features of the generic replacement product."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.thinkcrucial.com/products/2pk-belts-fit-shark-nv350-hv400-nv500-series-vacuums>