Kammala jumla mai zuwa: Ovruch slate spindle whorl - spindle whorl, wanda aka sassaka daga dutsen slate mai ruwan hoda da ja (pyrophyllite slate), wanda aka haƙa a yankin Ukraine na yanzu, kusa da garin Ovruch a ƙarni na 10 - 13. Malaman Ovruch sun maimaita maimaita nau'in nau'i na yumbu na yumbu - biconical (nauyin kamar dai ya ƙunshi nau'i biyu da aka haɗa da su ta hanyar tushe mai zurfi) Matsakaicin nauyin nauyin nauyin kimanin 16 g, tsayin ya kasance daga 4 zuwa 12 mm, diamita na waje daga 10 zuwa 25 mm, diamita na rami don spindle ya kasance 6<unk>10 mm. Idan aka ga cewa ƙwanƙolin yana da ƙunci sosai, sai a nannade shi da zare don kada ya zame sa'ad da ake juyawa. Slate - dutse mai laushi; a kan samfurori da masu binciken ilimin kimiyya suka samo, har yanzu akwai raguwa daga zaren. An tsara samar da shinge na slate a Ovruch don manyan tallace-tallace. 'Yan kasuwar da suka sayi jigilar kayan kwalliyar sun yi tafiya mai nisa tare da su, sun sayar da su a ƙasashe daban-daban. Masu binciken ilimin kimiyyar kayan tarihi sun gano ovruch spindle whorls ba kawai a cikin yankunan Kievan Rus ba, har ma a wasu yankuna. An tsara samar da spindle whorls don sayarwa mai yawa. A cewar A. V. Artsikhovsky, "sun yi daidai a Kiev da Vladimir, a Novgorod da Ryazan, har ma a Cherson, a cikin Crimea da Bulgaria a Volga". Kayan kwalliyar Ovruch sun kasance masu daraja sosai cewa masu mallakar sun sassaƙa alamun kansu a kansu, kuma bayan yaduwar rubuce-rubuce - sun sassaƙa sunayensu. A cikin karni na 13, dutse spindle whirls zama yumbu sake: da
Masu mamaye Tatar-Mongol sun lalata ɗakunan Ovruch.