This is an upgrade for Real Space's 1/72 scale Vostok 1 kit. These replace the wire you're supposed to bend up to make the communications antennnae. This is me lacking the skills to consistently bend the very tight wire shapes. Maybe someone else lacks those skills too.
Real Space's Vostok 1 kit can be purchased here:
https://www.realspacemodels.com/shop-galapagos/172-vostok?category=1%2F72+Kit