High quality Elastic PU material, light weight,adjustable and comfortable
Arc-shaped aluminium inside and training ball can fix fingers and wrist in the function position
Multi-functions:separage and train fingers;increase the finger flexibility;prevent finger joint deformation and muscle atrophy
Size:One size fits most, both OK for right and left hands, for the maximum wrist circumference 29cm / 11.4inches,Give two Hand Extensor Exerciser
Perfect after sale, There is a full purchase price refund within 30 days of your purchase if you are not happy for any reason.