Bikunze gukoreshwa byerekana gushyiramo ibyuma ni mpandeshatu isanzwe, impande enye, pentagon, inyabutatu ya convex, umuzingi na rombus. Diameter yumuzingi wanditseho umwirondoro wibanze nicyo kintu cyibanze cyicyuma, kandi ubunini bwacyo (mm) ni 5.56, 6.35, 9.52, 12.70, 15.88, 19.05, 25.4…. Bamwe bafite ibyobo hagati kandi bimwe ntibifite; bamwe badafite impande zinyuranye zubutabazi; bamwe badafite chip yameneka, nabandi bafite chip kumena kuruhande rumwe cyangwa impande zombi.