TYWH COMPANY LIMITED mainly manufactures and exports Calcium Carbide. We have our own fabrication plant. Generally the gas yield is about 295L/KG and the export size is 1-4mm, 4-25mm, 25-50mm, 50-80mm, 80-120mm. The package is new iron drum which are 50kgs and 100kgs and generally the colour of drums are black, grey and green. Awaiting for your kindly inquiry all the time. Thanks & Best regards, Yours, Jessica TIANJIN TYWH IMPORT AND EXPORT CO.,LTD. TYWH COMPANY LIMITED. ROOM 1001,BLOCK 7-1,JINGMING GARDEN,XIANSHUIGU TOWN ,JINNAN DISTRICT,TIANJIN CHINA. TEL: 0086-22-28546072/73 EXT 801 FAX: 0086-22-28546075 Mobile:0086 15122978857 Website: http://www.tjtywh.com.cn E-mail:Jessica@tjtywh.com.cn MSN:Jessica.tywh@hotmail.com