If you have the most unfortunate honour of having a tiny little dicklet hanging between your legs then this Holy Trainer v3 nub is exactly what you're looking for. No Master or Mistress wants to see that pathetic micro penis exposed, so get one of these chastity cages locked onto your poor excuse for a cock and willingly hand them the key.
Discretion is likely to be a significant consideration for you if you have a tiny penis as this device will likely add a little size to what you had before. Thankfully the internal lock still makes it secure and discreet, so you still don't need to worry. The lock comes with 2 keys, so you have a spare one in case of emergencies. If you have a long distance keyholder you can send one to them and freeze the spare key in ice. Send them regular pictures of the frozen key and they'll be encouraged that your teeny cock is still securely locked up.
This chastity device includes 4 ring sizes (36mm, 40mm, 45mm and 50mm) so that you can experiment to see which ring size fits you best. If you already own a V2 cage and ring set unfortunately they aren't compatible with this V3 version cage.
The Holy Trainer nub is completely waterproof and can be worn comfortably in the shower. Despite this, we still recommend that you remove the cage at least one a week to thoroughly clean yourself. If your keyholder does decide to unlock the cage and play with you (though with a cock that size I'd be surprised if they ever let you out) it's best to been clean. The tip of the cage has a urination hole, so you don't need to remove it at any point to pee.
We also have the Holy Trainer v3 available in maxi, standard, small and nano sizes if you don't have a pin dick and need something bigger. These sizes are available in clear, black and pink.