【suitable for heavy or thin line】The needles are smooth, suitable for heavy or thin line. 【TPR silica gel】The handle is made of TPR silica gel,it is very safe and gentle to your hands. 【9 different sizes】Complete specification,9 different sizes of needles to satisfy all your needs.You can use this tool set knit the product as you like. 【ergonomic】This ergonomic soft crochet hook makes you crochet for hours without fatigue, feeling pain or cramping on hands or thumbs.