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We report the detection of oscillations in slender Ca II H fibrils (SCFs)from high-resolution observations acquired with the Sunrise balloon-borne solarobservatory. The SCFs show obvious oscillations in their intensity, but alsotheir width. The oscillatory behaviors are investigated at several positionsalong the axes of the SCFs. A large majority of fibrils show signs ofoscillations in intensity. Their periods and phase speeds are analyzed using awavelet analysis. The width and intensity perturbations have overlappingdistributions of the wave period.  The obtained distributions have median values of the period of $32\pm17$s and$36\pm25$s, respectively. We find that the fluctuations of both parameterspropagate in the SCFs with speeds of ${11}^{+49}_{-11}$ km/s and${15}^{+34}_{-15}$ km/s, respectively. Furthermore, the width and intensityoscillations have a strong tendency to be either in anti-phase, or, to asmaller extent, in phase. This suggests that the oscillations of bothparameters are caused by the same wave mode and that the waves are likelypropagating. Taking all the evidence together, the most likely wave mode toexplain all measurements and criteria is the fast sausage mode.

Oscillations on width and intensity of slender Ca II H fibrils from Sunrise/SuFI