I was tired of putting harsh flea chemicals on my pets so I began researching alternatives. I began learning about amber collars and gave it a try. We lead a fairly active lifestyle with hiking, camping and exploring so I was worried the collars wouldn’t stand up. So impressed! I found Mo +Lo collars and fell in love with the nautical color so I ordered one for my bulldog and my cat. The quality of these collars compared to past ones is quite obvious. These collars are quality and the amber stones are much larger than previous ones I’ve purchased. I ended up ordering a third collar in the summer sunset color for my basset hound and was equally impressed.One tip I suggest is to remember these collars do stretch a bit. I was in between sizes so I ordered down and this solved the problem. Highly recommend this product!