Medical Grade LG PC The frame made by PC polycarbonate, Polycarbonate is colorless, transparent, heat resistant, impact resistant, flame retardant, BI grade, and has good mechanical properties at normal use temperatures. Lowest Tin Solder The needles wire is fixed by fogging and ...Medical Grade LG PC The frame made by PC polycarbonate, Polycarbonate is colorless, transparent, heat resistant, impact resistant, flame retardant, BI grade, and has good mechanical properties at normal use temperatures. Lowest Tin Solder The needles wire is fixed by fogging and discharging needles, plastic sets and precise moulds, which greatly reduces the welding process, thus avoiding the chemical pickling process and ensuring the safety and hygiene of each needle wire.