Heerka waxqabadka ee boolal loo isticmaalo isku xirka qaab dhismeedka birta waa 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9 iyo wixii la mid ah. Bolts ee fasalka 8.8 iyo wixii ka sareeya waxay ka samaysan yihiin birta kaarboon alloy hoose ama birta kaarboon dhexdhexaad ah iyo kulayl-la daaweeyay (damiyay, dabcay), kuwaas oo guud ahaan loo yaqaan 'high energy bol'.
Sii akhri