A Great Beginner's Strap on Kit This kit has what each couple needs for exploring new penetration options. The comfortable harness is made out of nylon/cotton and has a fur based front. The 4 way adjustable nylon strap fits up to 60 inch hips. The slender silicone dong measures 4 1/2 inches in height and is 3/4 inches in diameter. The O-ring is fixed into the harness and accepts other 1 1/4 inch diameter dongs.