comments:
korbworksout posted on r/prostatecancer2w
You're welcome!! They appear to be soft rubber. A full charge lasts through several uses...depending on how long you use it and how good a seal you have. The device monitors vacuum and will reset the amount of vacuum as air infiltrates. I probably re-charge once a week or so...ish. Here's the Amazon one I bought. https://a.co/d/03xQtlCr