Synthethic whale baleen/boning diff. widths

You don't need boning caps, you can cut the boning with sturdy scissors and file them round to keep from getting sharp edges.

Bonings for corsetry, which one should you choose? - Secret Times

Boning for Dressmaking: Types, Uses and Sewing Technique

Bonings for corsetry, which one should you choose? - Secret Times

Synthetic 4mm Whalebone Ideal for Bodies/corsets and Sleeve Supports 10 Yards

Plastic whalebone 7mm - Roda Traden AB

Exceptions to Corset Rules – Lucy's Corsetry

Bonings for corsetry, which one should you choose? - Secret Times

Boning in corsets: Everything you need to know – Miss Leather Online

Plastic Boning for Sewing, Corset Supplies

Plastic Boning for Sewing, Corset Supplies

18th C. Boning Research & German Plastic Boning Review – Démodé

Synthetic Whalebone - 6 mm X 1.5 mm