Thank you for viewing. This is a substitute for the balls (coal) used in Tomica and Plarail toys. While not official products, the size is almost the same. - 30 balls Immediately after purchase, I handled them with gloves and put them in small paper envelopes. I have confirmed that they can be used without problems in "GURUGURU MAWASOU! Thomas and Merlin's Coal Hopper Set." [Plarail Series] "Plarail Loading and Unloading Freight Train" "GURUGURU MAWASOU! Thomas and Merlin's Coal Hopper Set" "Plarail Playable Engine! Big Thomas" "Thomas the Tank Engine Steam Shoo! Big Thomas" "Wilson's Stone Quarry Loading and Unloading Set" [Big Loader Series] "Working Car Big Loader" "Thomas the Tank Engine's Big Loader, Cranky at the Port" "Thomas the Tank Engine's Big Loader, Terence's Quarry" "Thomas' Big Loader Wide Set" "Thomas the Tank Engine and Harold's Big Loader Set" "Big Loader Thomas the Tank Engine Loading and Unloading Set Everywhere" [Tomica Series] "Tomica Action Construction Site" "Tomica Town Moves! Loading and Unloading Construction Site" "Tomica Town Build City Power Crane Construction Site" "Tomica Site Transformation Mega Ton Dump" "Tomica Bull Station" "Tomica Bull Road" "Tomica Bull Conveyor" "Tomica Construction Value Set" "Tomica Town Play Charge Series Construction Site Stepping Conveyor" "Tomica Town Play Charge Series Construction Site Tower Crane" Plarail Coal