Expansion Beads are used with render and placed over movement joints found in substrates and changes in substrates. Expansion Beads are designed to help reduce cracking in render at high stress areas and can also be hinged through 90o for internal corners. What are the features of ProBead Expansion Bead? Lightweight - for ease of handling Easy to cut compared to traditional metal beads Cost-effective - due to time savings Excellent keying to reducing render or plaster waste Non-corrosive - no staining on the walls due to rust Non-flammable 25-year guarantee against failure Technical Colour: PrimroseMaterial: 100% reground PVCuRender depth: 10mm Length: 3mTotal Length: 102m