• Apẹrẹ tuntun – awọn apo ilọpo meji ti a fi tapered fun ṣiṣan afẹfẹ to dara julọ• Agbara kekere pupọ ati lilo agbara• Ilọsiwaju pinpin eruku fun DHC ti o pọ si (agbara idaduro eruku)• iwuwo ina