I purchased these discs for my nearly 3 year old son, as we were going away on holiday. You get six in total- three for each arm and they clip together to stop them moving around. He’s been going to his toddler swim sessions prior to build his confidence and uses a similar product. The discs were a god send as he has two older brothers and wants too keep up with them both. He uses 3 on each arm for now but it won’t be long before I have to start reducing them down to two on each. The discs kept my very heavy ‘man child’ above water no problem and he had a great time swimming unaided in the lazy river on holiday. They are going to be used every time we go swimming until he can swim unaided. They are worth buying as the are lightweight and enable my son to feel confident, whilst developing his doggie paddle as a beginner. The arm bands I brought many moons ago/tried/tested and failed, are in a cupboard waiting to be sold. The only thing to take into consideration, is the fact they do take up room in a suitcase, but that’s a tiny negative when your child’s safety outweighs this factor!