Two porcelain pieces are each 12" long and have markings of CAL-61013A, only a small flea bite or two. The two glass pieces are both embossed PYREX, the larger piece is 7.5" long and appears to have a rear embossing of PAT and some numbers, no chips, ground on each end; the smaller piece is 7.125" long, no chips and very lightly ground on one end. ...all four insulators shipped for $20.