No, glowrings are not imported to the U.S. directly, because they are considered a "novelty item" and consequently, under 10 Code of Federal Regulations, NO radioactivity is acceptable in a novelty item in the U.S. Since tritium dialed watches have a "legitimate" use, they are acceptable, and actually have more material than a single "glowring". Actually, mailing them is not "illegal" per se, since the amount of radiation emitted by a glowring is well below the acceptable standards for the USPS. But Customs, well that's another story......