This a spider Tour insert made from PETG Carbon fiber.This is a direct replacement for the insert currently in the spider tour putter ( you will need to check if your insert is 3mm or 5m as it varies by model). You can choose your design with or without the grooves. It’s your choice.The insert can be made anywhere from around 3.81grams up to 5.90grams +-.20g.The insert can also be made in ABS, in these colours:Gold, red, black, white,yellow. And PLA in Blue, pink, black, green. (Weights in ABS and PLA vary)I do have a SIK face variable loft style insert (seen in pink in the photos) as well for sale. These have now been tested and work great. Because of how they are manufactured, I can’t accept returns on them unless there is a defect.