The SLK by Selkirk Hybrid ball was designed to be played both indoors or outdoors and engineered to create extended rallies, offering a great playing experience for both new and veteran players. Durability: Designed to last. 
Great for Beginners: Optimal ball for beginners or pickleball programs. 
Indoor and Outdoor Play: The SLK Hybrid ball was designed to be able to play both indoors and outdoors.
Extended Rallies: Engineered to stay in play, creating extended rallies which offer the ultimate enjoyment in your game, no matter your level.