iSpacer® are made from adhesive tapes in different thickness. Simply press a spacer to a microscope slide or coverslip, a sealed watertight well is formed to contain RapiClear in place and prevents evaporation. The well is sturdy and provide supreme support to thick and free-floating specimens, allowing preservation of tissues’ delicate internal structures without compression. The specimen and spacer can be sandwiched between two coverslips. To better fulfil the user’s different application needs, iSpacers not only come in various thicknesses, there are also iSpacers with single-sided stickers, as well as double-sided stickers. Utilizing these various designs, iSpacers can be stacked to create different depths desired for direct use with confocal microscopy.