These are the Half Moon Border Supports. These are made of iron and were imported from Europe.

Half Moon
12" w x 23.5" tall, 1.4 lbs  $15.95
17.75" w x 35" tall, 2.1 lbs  $19.95
19.5" w x 43" tall, 2.5 lbs  $24.95
24"  w x 48" tall, 2.9 lbs  $29.95

Stubby Half Moon
18" w x 19" tall, 1.4 lbs  $16.95
19" w x 21.5" tall, 1.6 lbs $18.95
23" w x23.5" tall, 1.8 lbs $21.95