The wrist/thumb splint can be utilized for both wrist and thumb injuries. The adult kit contains one 3" X 10" fiberglass splint, one 3" elastic bandage, instructions, and a wetting pouch. The child kit contains one 2" X 8" fiberglass splint, one 2" elastic bandage, instructions, and a wetting pouch. Both kits come with and without water for fiberglass activation. Adult sizes recommended for subjects greater than 5'4" tall, child for subjects less than 5'4" tall. Please review the application video for best results.