Every year the supplement Netherlands Sheets Extra (4) appears, which contains sheets of extra heavy paper (170 grs.) with plasticizer-free clamp strips.
Here you can store the stamps from the sheets issued in the previous year.
On all sheets there are frames where you can put the stamps, usually with a picture of the stamp itself. On all these frames are transparent mounts to safely place your stamps in.
The Supplement Netherlands Sheets Extra (4) contains the year 2021.
The content consists of 7 pages; V172a,V172b,V174a,V174b,V174c,V174d,V174e.