Space series ABS toy bricks Early Childhood educational toys boy small particles assembled Kits blocks Compatible with LEGO|early childhood|assembly kitblocks assemble - AliExpress
BrickLink - Part 973pb0539c01 : LEGO Torso Bare Chest with Muscles Outline Detailed Pattern / Light Nougat Arms / Light Nougat Hands [Minifigure, Torso Assembly, Decor.] - BrickLink Reference Catalog
Sports Fun Pack - 32 Minifigure Accessories Detail - Custom Molded ABS Plastic - Classic Design - Compatible with All Major Brick Brands : Toys & Games
Custom Design Torso - Muscles - Yellow
The Ultimate Guide To Abs And Core
▻ It's not just ABS plastic at LEGO, a dozen different plastics are used - HOTH BRICKS