25 Lighthouse Vario 4S pages - Professional pack Each sheet measures 8-1/2" x 11" 4S is black with four 7-5/8" x 2-1/2" pockets per side Double sided (pockets front and back) Archival quality - 100% FREE of acid and chemical softeners and will not harm your stamps Made in Germany by Lighthouse, a world leader in high quality stamp and coin products