From the manufacturer:

Introducing the perfect alternative for dogs who dislike foam in their mouths - the Water and Woods® Vinyl Dog Training Dummies! These floating dummies are a fantastic choice when teaching your pup how to retrieve. Designed with grooves for easy pick up and improved grip, your furry friend will find them comfortable to carry and hold during training sessions. The added benefit of easy inflation and deflation allows you to customize the size to suit your dog's preferences, ensuring the perfect fit. These can be paired with training scents and bands for a more realistic training experience. With the Water and Woods® Vinyl Dog Training Dummies, your pup will master the art of retrieval, making training sessions more enjoyable and effective.