Single Decade Car Rosary with Black Wooden Beads. This one decade of the rosary has a St. Christopher junction, the patron Saint of Travellers. The rosary also comes with a clasp to help fit it over a rear view mirror. Bead size: 8mm round. This size of single decade rosary, is great for people looking for larger sized beads on a One Decade Rosary, for personal use. Please see recommended items for Rosary Purses and How to Pray the Rosary Booklets.