Iyo Tasical Series Back Extension ine yekufamba-in dhizaini ine inogadziriswa kumashure rollers, ichibvumira mudzidzisi kuti asarudze akasununguka huwandu hwekufamba. Iyo yakawedzera chiuno padhi inopa yakasununguka uye yakanakisa tsigiro mukati mese kwese kwekufamba. Iyo yese mudziyo zvakare inogara nhaka zvakanakira iyo Tasical Series, yakapusa lever musimboti, yakanakisa mitambo ruzivo.