Pelican 1500 / 1501 Upgraded 4 piece foam set. 1 convoluted lid foam, 2 middle pluck pieces, and 1 bottom pad. Pelican 1501 / 1500 replacement upgrade set. 1 Convoluted lid foam 2 Middle pluck - 17.25" x 11.50" x 1.75"(approx). 1 flat bottom piece. Fits either 1500 or im2300 case. 2 layers of pluck. Allows you to be more creative with desiging