Jack is a 2-in-1 representation FTM stroker & packer. Jack is 100% soft silicone. The stroker cavity is ribbed and will create fabulous suction for anatomy at least 1/2â³ in diameter. Jack can stretch to accommodate larger anatomy. Jack may work with smaller anatomy but will not create any suction during use. Check out Buck Off Kiss-X if you're on the smaller side and are looking for a stroker with suction.