Ahem,
I have been asked to remove my gear essentials "Imperial" cockring for that very reason, and I did acquire a silicone rubber one of comparable dimensions ...
https://cdn.shopify.com/s/files/1/0160/2562/products/IMG_7478_1400x_1a5e4ed8-bdeb-489c-bfe5-f95442358fb4_1400x.jpg?v=1500514818
(picture is not me, but from the gear essentials website).