I was considering getting these rings for use in a dildo harness. Unfortunately, they're TPR silicone. Does anyone know where I can find some pure silicone rings? While I'm at it, does anyone know where I can get rings larger than 2" diameter unstretched? Metal rings provide better support for larger toys but I'm not fond of how they feel and I'm always worried about metal denting silicone dildos if the fit is tight.