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This is the original SLS printed Tail Clip without Pull-Pull wheels and slightly rounded to allow printing in PLA with a removable 'mesh' for in-print support. Please see the (more expensive, higher resolution) SLS in Strong White (Black) Plastic for details. NOTE; Shapeways PLA Checker failed this for "thin walls" so it might not 'show' for PLA at about $26. "Thin" meaning no problem to your results. The software will "Fix Thin Walls" repeatably, but not save those results. So just use Fix Thin Walls when you order until SW fixes this glitch. Thanks.