I’ve worn a CritSuccess (http://www.critsuccess.com/) r20 when playing D&D now and then since early 2014 and have been happy with how the ring works as a dice replacement. Today I received a r12 and a 2r10 (r100). When my D&D group gathers again they should expect some greataxes and heavy crossbows. Thanks for making great products, CritSuccess!