(1)OD:1/4"&/3/8";1/4"1/2";1/4"&5/8",etc. (2)WT:8mm,9mm,10mm ,etc (3)Length:20m,30m (1)OD:1/4"&/3/8";1/4"1/2";1/4"&5/8",etc.(2)WT:8mm,9mm,10mm ,etc(3)Length:20m,30m,etc(4)Pair insulation copper pipe is used ofr air conditioner ,pls feel free to contact us if you are interested in our products