This ring is solid and smooth on the inside, not hollowed out. It is made to order to your specific size.This is a very large skull ring that weighs approximately 38 grams in Sterling Silver. Each ring is made to order to your exact size, so be sure to measure accurately to order the correct size. Please allow up to 4 weeks for custom casting to your exact ring size from solid Sterling Silver, finishing & polishing & delivery to your door..