4 Sided Resilient Nail Buffer Blocks: Made of upgraded sand surface sponge, high-elasticity, sturdy and durable, washable and reusable, good for polishing and smoothing acrylic nails, fake nail tips or natural nails, dip power or gel nails; Medium 100/150 Grit: The medium grit sanding paper on the flexible high density sponge can take much better care of your nails and provide you consistent and pleasant trimming and buffering experience; Right Sized Ready On The Go: the 3.7 inches buffer blocks are just right size, neither too big nor too small; it is in your palm of hand to polish, or to take it on the go for traveling; Wide Usages: the 4 sides buffing blocks are suitable for natural nails, fingernails, toenails, acrylic nails, false nails, etc., also good for salon and home; it is also a perfect holiday gift idea.