These 2" Flexible tubes can easily slide into those small cracks and crevices. The variety pack will give you 8 tubes in a variety of colors: white, green, black, yellow & red. The small sizes will fit 1 cotton swab on each end, and it’s great for AKC hides which require only one swab. And the medium size will fit 2-4 swabs. You can also use unscented swabs to secure your scented swabs inside of the flexible tube.