Six ESTA TSP standards approved Monday, 17 May 2021 All six documents are available on the ESTA TSP website for download USA - On 5 May, ANSI's Board of Standards Review approved two ESTA documents as American National Standards. The following day, ANSI's BSR approved four more. All six are now published and available on the ESTA TSP website for download at no cost at http://tsp.esta.org/freestandards. You also may buy them from ANSI and IHS Markit for $40 each. ANSI E1.2 – 2021, Entertainment Technology - Design, Manufacture and Use of Aluminum Trusses and Towers describes what the title says, and also the associated aluminium structural components, such as head blocks, sleeve blocks, bases, and corner blocks, used in the entertainment industry in portable structures. It's a revision of and supersedes the previous version.