I purchased some various sized stainless steel rings that are 'usually' used for marine type purposes only. They are 'ZENITH' brand & work very well. They were chosen for the soul use that they would never wear out use wise & for placing over the penis & other parts in various ways I could tolerate without injury. They seemed cheaper in sets than the 'real' penis rings that are made for that purpose. Be careful when choosing sizes that you know will suit you when erect & on varous area's of the penis thou. I have 3 different sized rings for exploring with. They all work extremely well & produce very hard erections than you would get normally - but still safe to use for long / short periods depending on your tolerance levels! I do use lubricant -if needed? Hope this maybe an alternative for you to try. RE: Sleeves, no sorry , I havent gone there yet.