https://asrmaterials.com/product/arched-casing-bead-3/
ARCHED CASING BEAD - ASR Materials
casing beadarchedasrmaterials
https://jhbuilders.com/product/90403-mdf-pr-bead-casing-5-8x3/
90403 Mdf Pr/bead Casing 5/8x3" - J&H Builder's Warehouse
Sep 22, 2021 - Casings are used to encase the area around doors or windows where the frame meets the drywall.