Silicone nipple covers are reusable.  One size. Available in Light Brown/Nudeish and Dark Brown.

Black-X nipple (covers set of 10) are not silicone.  One size.

Nude Petal nipple covers (set of 10) are not silicone.  One size.

Kiss nipple covers (set of 8) are not silicone.  One size.

Kiss Me nipple covers (one pair) are  not silicone.  One size.

Pink Star nipple covers (one pair) are not silicone.  One size.