Griffin Jewellery Elastic Cord 25 m Green Diameter 1.0 mm – Elastic Thread for Bracelets (Silicone Thread, Elastic Thread) : Amazon.co.uk: Home & Kitchen
Elastic cord stopper toggles, cord adjuster silicone - From UK
9mm x 6.5mm Silicone Cord Stoppers - Black & White (Pack of 100) - Trimming Shop
APLI Kids Spool With Silicone Stretch Thread | Kids Made