Glass block spacer,made of ABS,PP or HIPS,used for glass block space during wall building,size available 80,95,98series ... spacer:made of ABS,PP or HIPS plastic material,used for glass block space fitting during wall building,size available 80,95 ... .for Porcelain crpss spacer:2.5x2.5mm,5x5mm is available Glass block spacer