Iyo Fusion Series (Standard) Back Extension ine yekufamba-in dhizaini ine inogadziriswa kumashure rollers, ichibvumira mudzidzi kuti asarudze zvakasununguka huwandu hwekufamba. Iyo yakawedzera chiuno padhi inopa yakasununguka uye yakanakisa tsigiro mukati mese kwese kwekufamba. Iyo yese mudziyo zvakare inotora zvakanakira iyo Fusion Series (Standard), yakapusa lever musimboti, yakanakisa mitambo ruzivo.