Description General description Designed for building biomolecules and complexed molecules such as steroids and peptides. The idea of α-helix or β -sheet in peptide molecules can be visualized. Suited for studying biosynthesis through nucleotides. 383 pieces. These models combine the idea of both ball-and-stick and space-filling models for visualization of molecular frameworks as well as molecular structures covered with electron clouds. Color-coded model parts are made of flexible polyacetal covered with transparent polyacrylate. Can be used interchangeably with HGS biochemistry molecular models. Elementary set= 137 pieces Research set= 383 pieces Scale: 1 Å = 1.0 cm.