Ollie Neglerio, Taylormade's content creator had a post on his instagram (great follow if you don't follow already) of a potential Spider for TW. In the comment section of the post he answers question about TW's putters. TW is using the standard Aluminum insert. Tmade gave him two options insert wise; one being surlyn or aluminum and he went with aluminum. Only difference from stock model head wise is the neck (closer to the 8802 neck) and the weights. Another notable difference is the shaft, same putter shaft he has always used. Also, the blacked out Pingman grip.