What does Work 8-10-10 dc in ring in a crochet pattern?

This may have been explained in the 'Crochet tips' section. The pattern can be used to make 3 different sizes. You work 8 dc in the ring to make size 'small', 10 dc to make size 'medium', and 10 dc to make size 'large'. The pattern should have explained what the measurements were for each size, so you know how to decide which size to make.