Castaldo See Through Mold Frame 1 7/8" x 6" x 1-1/2" Castaldo see-thru mold frames work with Castaldo Liquid Mold Rubber, Castaldo Quick-Sil RTV molding rubber and other brands of Liquid Mold Rubber (LMR) or RTV This mold frames make molds that are 1 7/8" x 6" x 1-1/2" by various thickness