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No other pairing in the series reaches this far on a single board. The STALEKS SMART 40 mineral file in grit 100/180 starts by shaping with its 100 side and ends by smoothing the edge with its 180 side, with no intermediate grit needed on a straightforward service. A 162 x 25 mm crescent, grey mineral treated with stearate, thin foam between grit and board. A single-use file, supplied in a pack of 25.
Every dual-grit file bridges two moments of the work. The STALEKS SMART 40 crescent mineral nail file in grit 100/180 throws the longest bridge in the series: on one side the grit that gives the nail its shape, on the other the one that closes the edge and gets it ready for colour. In between, nothing is compulsory as long as the appointment stays simple. A 162 x 25 mm crescent, grey mineral from the SMART line by Staleks, pack of 25.
On a short booking the question is not having every grit but having as few as possible to reach for. This file answers that case: open a sleeve, shape, flip, finish, bin it. The desk does not fill up with a spread of references and the protocol fits in one sentence.
It is also the file you take when working away from the salon. A single reference in the case covers the shaping and the finishing of a classic manicure, with no assortment to put together before leaving.
The 100 side sets the geometry. It straightens a sidewall, brings length back, settles a corner, on gel as much as on polygel or acrylic. It works frankly, but leaves behind a surface that is not presentable as it stands.
The 180 side answers precisely that. It smooths the edge, rubs out the marks of the 100 and leaves a rim that feels soft to the touch. On a natural nail it is enough to shorten and close a free edge at the end of a manicure, with the other face never coming into play.
A grit gap this wide has a limit worth knowing. On a thick build, 100 is not the right starting point: you will need to drop lower in the series to take the bulk down before coming here. And for a very soft finish, a grit above 180 remains preferable.
Put another way, this file is built for services that unfold without surprises. As soon as the work gets complicated you return to a full grit chain, and this reference goes back to its role on straightforward bookings.
The 162 mm of length allows two ways of working. At the centre of the crescent the travel is long and serves shaping. Towards the tips the contact narrows and allows the short corrections in the corners that finishing calls for.
The 25 mm of width gives the backing a free edge needs to stay flat under pressure. The straight edge of the crescent works the length; the curved edge presents itself towards the cuticle area and along the lateral folds, which a straight file cannot approach so closely.
The grey shade of the abrasive identifies the SMART series, white belonging to the EXPERT range. The stearate coating laid over the mineral delays the moment when dust fills the relief: on a file expected to last a whole appointment, that detail shows.
The thin layer of foam under the grit softens the contact just enough for the 180 face to follow the curve of the nail. This is not a thick foam body: the board stays firm, which is what lets the 100 hold a straight line.
The STALEKS SMART 40 grit 100/180 finds its place in tight diaries: enhancement upkeep, plain manicure, a reshape squeezed between two longer appointments. One file out, one service done, one file gone. Since the pack of 25 is the range's only format, the box holds exactly the count of appointments ahead.
No other pairing in the series reaches this far on a single board. The STALEKS SMART 40 mineral file in grit 100/180 starts by shaping with its 100 side and ends by smoothing the edge with its 180 side, with no intermediate grit needed on a straightforward service. A 162 x 25 mm crescent, grey mineral treated with stearate, thin foam between grit and board. A single-use file, supplied in a pack of 25.