WE ARE MANUFACTURER OF VACUUM BLOOD COLLECTION TUBES(PLAIN TUBE,SERUM TUBE,ESR TUBE,CITRATE TUBE,GLUCOSE TUBE,HEPARIN TUBE,SST TUBE AND ETC.) IN WEIHAI,SHANDONG,CHINA.WE CAN ALSO SUPPLY YOU WITH OTHER DISPOSABLE PRODUCTS OF GOOD QUALITY AND BEST PRICES .IF YOU ARE INTERESTED,PLS CONTACT US.THANKS.