25 - 45 RPM Variable Depth Mailer Boxes and 50 - 7.5" X 7.5" Corrugated Filler Pads 25 - 7.5" x 7.5" x .5" or 1" variable depth mailer boxes Variable depth: scored at .5" and 1" to make your required height Securely holds 1-4 albums or other items 50 - 7.5" x 7.5" filler pads to protect your shipment! Mailers and pads manufactured with 32ECT corrugation (roughly equivalent to 200# test)