glass ground joints 1.Material:borosilicate glass 3.3 2.high quality, ... glass ground joints1. thicker wall, good quality,our glass joints won't shake or wobble and won't crack if ... reheared.2.femail and mail joints, the same price,doubele opening.3.regular color : clear, ... small carton case, and 4 cases is a big case, the volume of 1000pcs glass joints is 0.05CBM, and 20kgs. double ...