This listing is for a replacement brush for KBShimmer nail polish bottles. You are purchasing a single brush.
To replace brush only: Open polish bottle and wipe excess polish from the brush. With a paper towel, firmly grasp the brush in one hand and cap in the other, then pull until brush releases from the cap. Insert new brush in the polish bottle, place cap on brush and bottle, twisting cap completely closed. Twist cap off and brush will be attached.