hien tai toi co 1doi bong 4.5 va 1chiec nhan 5.4 nay toi muon doi thanh 1bo bong va nhan giong nhau thi phai lam sao neu dem den doi vo nhan sao cho giong vo cua bong tai thi co dam bao an toan la khong bi doi hot khong?va phai lam nhu the nao ?va den cua hang nao la ok?