From Sinclair Institute. Medical grade silicone is body safe, phthalate free, PVC free and latex free. High quality, skin like softness warms quickly to body temperature with contact. Comfortable tapered tips designed for ease of insertion. 5 graduated sizes for natural and effective transition and progression. Large bases add control and leverage. 6 language instruction booklet included. Sizes in order of large to small: Orchid probe 5.5 inches by 1.25 inches, Blue probe 4.6 inches by 1 inch, Lavender probe 3.9 inches by .875 inch, Coral probe 3.3 inches by .75 inch, Yellow probe 2.8 inches by .5 inch.