hand exerciser improve finger forearm strength flexibility adjust finger strings design comfortable grip conditioning

blue, without m-3lb black without standard-7lb red, no label-11lb orange, no label-11lb green without label-14lb light gray, no label-3lb medium gray, no label-7lb dark gray, no label-11lb black without standard-14lb blue dispensing-3lb black dispensing – 7lb red dispensing-11lb orange dispensing-11lb green dispensing-14lb light gray glue dispensing-3lb medium gray adhesive – 7lb dark gray glue dispensing-11lb black dispensing-14lb 3 paper containers (dimensions: 9.2*7.2*9.2) four paper containers (dimensions: 9.2*9.2*9.2)

spring spring grip