Riverbyland Iron On Patches Number 0-9 Red Fabric Patches Size: approx 10x6 cm each Use: iron on patches. The back hot melt adhesive is pro-environment and non toxic. Suggestion: sew on after iron makes patches more firmly. Can be sew or iron on patch to cloth, jean, jacket, T-shirt, cap and etc. Washing: gentle cycle or hand washing is best. Easy to use, easy to clean.