Features: 【DIFFERENT LEVELS RESISTANCE】Grey type, can bear three kilos. Suitable for early rehabilitation and early exercise. Blue type, can bear 4kg, suitable for the middle stage of rehabilitation exercise. Black type, can bear 5 kg, suitable for high intensity athletic person. 【SPORTS MUST】The finger strengthener is great for improving wrist, finger, and forearm strength and flexibility. The perfect gift for rock climbers, tennis players, guitar, piano, drummers, and musicians. 【SOFT AND ELASTIC】Made of silicone material, more elastic and more comfortable to use, and it is not easy to tear and can be used for a long time. 【PORTABLE SIZE】Designed in a compact shape, which is convenient for you to carry with you so that you can exercise at any time no matter where you are. 【STRENGTH TRAINING】Extension of the fingers training, exercise coordination and flexibility. Suitable for walking, traveling, in office, school, watching TV, etc. Specification: Material: silicone Color: black, grey, blue Feature: elastic, soft Size(approx.): (L x W) 98 x 97mm/3.86 x 3.82inch, small ring diameter 20mm/0.79inch, large ring diameter 52mm/2.05inch Package Included: 1 PC x Finger Strengthener Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 1-2 cm differences due to manual measurement.