I've been a customer of LandOfMarbles for several years. They have a wonderful assortment of quality marbles. This order was for an 11 year old autistic boy. He was "over the moon" with excitement when he received the package. I'll keep buying.
Size is as-packaged, or the diameter of loose marbles. ("D" is the diameter of round items other than marbles.)
Helter Skelter features a multi-color double ribbon core spiraling around each other from one end of the marble to the other. Color schemes include a blue/yellow ribbon twisting around a yellow/pink ribbon, white/purple twisting around white/orange or blue/purple ribbons - our choice of color please. This is a larger shooter sized marble measuring 7/8 to 1" or 22-25mm.