These Dentec Instant Cold Pack provide immediate cold therapy to help reduce swelling and provide comfort after an injury. Fast relief for bruises, swelling, muscle spasms and pain, headaches, and minor injuries.These portable instant cold packs eliminate the need for ice and can be used anytime, anywhere. 50 instant cold packs per box. Dimensions of Packs: 4" x 6" (10cm x 15cm) Single use only.