The Mirka NOVASTAR FLEX 5.1" x 6.7" Grip Perf. is an ultra-flexible hand sanding sheet for dry sanding, built for users who need clean, controlled sanding on curves, edges, and complex shapes. This is a hand sanding sheet designed for dry sanding on shaped surfaces and contour work. Model Number: FX-191-400. In this version, the sheet comes in 400 grit, which makes it a practical choice when you need a balanced cut and scratch pattern instead of a too-aggressive or too-fine step.

What matters here is how the sheet behaves when the surface stops being flat. Mirka states the abrasive surface does not wrinkle or break, and that there are no sharp edges even when folded. On the job, that means the sheet stays usable when you need to wrap it around a body line, reach into a recessed area, or feather a transition without the abrasive fighting back. That kind of flexibility is what separates a purpose-built sanding sheet from a standard sheet that works fine on a flat block but falls apart on real contour work.

The 5.1 inch by 6.7 inch format, also listed as 130 x 170 mm, gives you enough surface area for efficient hand sanding while still being easy to control. The grip backing adds another practical advantage for users who prefer a hand pad, but Mirka also notes the full and half sheets can be used with or without one. That gives you options depending on the surface and how much feel you want in your hand. For flatter areas, a hand pad helps maintain consistency. For tighter areas and transitions, going directly by hand gives you more control.

One of the smarter details on this Mirka sanding abrasive is the center perforation. Instead of burning through a full sheet on smaller work, you can tear it in half and keep moving. That is useful in automotive refinishing and detail prep where you are often chasing small sections, narrow contours, or localized repair areas. Less wasted abrasive and better sizing for the task usually means better efficiency at the bench and in the booth prep area.

Mirka also calls out easy cleaning and long life, which matters because hand sanding sheets that load up quickly cost time and consistency. A sheet that stays cleaner works more predictably through the sanding step and helps maintain the finish quality you are trying to achieve. Combined with the stated balance in cutting action and scratch pattern, this points to a sheet made for finish-sensitive work where surface quality matters, not just raw stock removal.

This Mirka NOVASTAR FLEX 5.1" x 6.7" Grip Perf. is a strong fit for automotive refinishing, bodywork prep, detail sanding, and any hand sanding job where shapes, radiuses, and hard-to-reach contours are part of the work. If you spend most of your time on flat panels with a block, you can use it there too, but its real value shows up when the panel shape gets complicated. For painters, body techs, detail refinishers, and serious DIY users who want a flexible dry sanding sheet that keeps its shape and finish quality, this is the kind of abrasive that earns its spot fast.

A Smart Pick for Curves, Edges, and Finish Work

The Mirka NOVASTAR FLEX 5.1" x 6.7" Grip Perf. earns its keep when flat sanding turns into real-world sanding and the panel shape starts fighting back.

• Who it's for: Automotive refinishers, body techs, and detail-focused users doing dry sanding on contoured surfaces.
• Why it stands out: The flexibility, fold-friendly design, and center perforation make it more useful than a basic hand sheet when the work gets tight or curved.
• Worth knowing: This listing is specifically the 400 grit version, so make sure that sanding step fits your process before you buy.

• What type of sanding is this sheet designed for? It is designed for dry sanding.
• Can it be used on curved or complex shapes? Yes. Mirka states it is made to tackle shapes and complex contours, and the abrasive surface is designed not to wrinkle or break.
• Can the sheet be torn into a smaller size? Yes. It has a center perforation for tearing in half.
• Does it need a hand pad? No. Full and half sheets can be used with or without a hand pad.