silicone super soft. on the Outside
ordered the stroker sleeve in June of 2023. Have been using it as an attachment with my pump and it works great! you get an extremely good seal around your penis and the pressure it exerts is just perfect while you are pumping. Make sure you lubricate the inside of the sleeve with water based lube first using your finger to apply it. That way your penis inserts easily into the sleeve and also gives a great feeling. Would recommend this sleeve to all pumpers.
Not much feeling with it. Had to finish with my hand 😏